Add `animated` to `Emoji` and `ReactionType`

Adds an animated structfield to `Emoji` and `ReactionType`'s `Custom`
variant, which defaults to false if not present.

A test has been added for deserializing it, taken from a REST API GET
Emojis response.

(cherry picked from commit 5286949f424e824784344ebb7b7af4e52fb819c3)

3 files changed, 29 insertions, 2 deletions

diff --git a/src/model/channel/reaction.rs b/src/model/channel/reaction.rs
index 5c1ee4d..0741cd7 100644
--- a/src/model/channel/reaction.rs
+++ b/src/model/channel/reaction.rs
@@ -170,6 +170,8 @@ pub enum ReactionType {
     /// [`Emoji`]: struct.Emoji.html
     /// [`Guild`]: struct.Guild.html
     Custom {
+        /// Whether the emoji is animated.
+        animated: bool,
         /// The Id of the custom [`Emoji`].
         ///
         /// [`Emoji`]: struct.Emoji.html
@@ -187,6 +189,7 @@ impl<'de> Deserialize<'de> for ReactionType {
         #[derive(Deserialize)]
         #[serde(field_identifier, rename_all = "snake_case")]
         enum Field {
+            Animated,
             Id,
             Name,
         }
@@ -201,11 +204,19 @@ impl<'de> Deserialize<'de> for ReactionType {
             }
 
             fn visit_map<V: MapAccess<'de>>(self, mut map: V) -> StdResult<Self::Value, V::Error> {
+                let mut animated = None;
                 let mut id = None;
                 let mut name = None;
 
                 while let Some(key) = map.next_key()? {
                     match key {
+                        Field::Animated => {
+                            if animated.is_some() {
+                                return Err(DeError::duplicate_field("animated"));
+                            }
+
+                            animated = Some(map.next_value()?);
+                        },
                         Field::Id => {
                             if id.is_some() {
                                 return Err(DeError::duplicate_field("id"));
@@ -225,12 +236,14 @@ impl<'de> Deserialize<'de> for ReactionType {
                     }
                 }
 
+                let animated = animated.unwrap_or(false);
                 let name = name.ok_or_else(|| DeError::missing_field("name"))?;
 
                 Ok(if let Some(id) = id {
                     ReactionType::Custom {
-                        id: id,
-                        name: name,
+                        animated,
+                        id,
+                        name,
                     }
                 } else {
                     ReactionType::Unicode(name.unwrap())
@@ -255,6 +268,7 @@ impl ReactionType {
             ReactionType::Custom {
                 id,
                 ref name,
+                ..
             } => format!("{}:{}", name.as_ref().map_or("", |s| s.as_str()), id),
             ReactionType::Unicode(ref unicode) => unicode.clone(),
         }
@@ -290,6 +304,7 @@ impl From<char> for ReactionType {
 impl From<Emoji> for ReactionType {
     fn from(emoji: Emoji) -> ReactionType {
         ReactionType::Custom {
+            animated: emoji.animated,
             id: emoji.id,
             name: Some(emoji.name),
         }
@@ -299,6 +314,7 @@ impl From<Emoji> for ReactionType {
 impl From<EmojiId> for ReactionType {
     fn from(emoji_id: EmojiId) -> ReactionType {
         ReactionType::Custom {
+            animated: false,
             id: emoji_id,
             name: None
         }
@@ -308,6 +324,7 @@ impl From<EmojiId> for ReactionType {
 impl From<EmojiIdentifier> for ReactionType {
     fn from(emoji_id: EmojiIdentifier) -> ReactionType {
         ReactionType::Custom {
+            animated: false,
             id: emoji_id.id,
             name: Some(emoji_id.name)
         }
@@ -380,6 +397,7 @@ impl Display for ReactionType {
             ReactionType::Custom {
                 id,
                 ref name,
+                ..
             } => {
                 f.write_char('<')?;
                 f.write_char(':')?;
diff --git a/src/model/guild/emoji.rs b/src/model/guild/emoji.rs
index 9581f77..919c29d 100644
--- a/src/model/guild/emoji.rs
+++ b/src/model/guild/emoji.rs
@@ -17,6 +17,9 @@ use {CACHE, http};
 /// guild it was created in.
 #[derive(Clone, Debug, Deserialize)]
 pub struct Emoji {
+    /// Whether the emoji is animated.
+    #[serde(default)]
+    pub animated: bool,
     /// The Id of the emoji.
     pub id: EmojiId,
     /// The name of the emoji. It must be at least 2 characters long and can
@@ -55,6 +58,7 @@ impl Emoji {
     /// # use serenity::model::id::EmojiId;
     /// #
     /// # let mut emoji = Emoji {
+    /// #     animated: false,
     /// #     id: EmojiId(7),
     /// #     name: String::from("blobface"),
     /// #     managed: false,
@@ -93,6 +97,7 @@ impl Emoji {
     /// # use serenity::model::id::EmojiId;
     /// #
     /// # let mut emoji = Emoji {
+    /// #     animated: false,
     /// #     id: EmojiId(7),
     /// #     name: String::from("blobface"),
     /// #     managed: false,
@@ -138,6 +143,7 @@ impl Emoji {
     /// # use serenity::model::id::EmojiId;
     /// #
     /// # let mut emoji = Emoji {
+    /// #     animated: false,
     /// #     id: EmojiId(7),
     /// #     name: String::from("blobface"),
     /// #     managed: false,
@@ -174,6 +180,7 @@ impl Emoji {
     /// # use serenity::model::id::EmojiId;
     /// #
     /// # let mut emoji = Emoji {
+    /// #     animated: false,
     /// #     id: EmojiId(7),
     /// #     name: String::from("blobface"),
     /// #     managed: false,
diff --git a/src/utils/message_builder.rs b/src/utils/message_builder.rs
index 580be82..f7dcae1 100644
--- a/src/utils/message_builder.rs
+++ b/src/utils/message_builder.rs
@@ -20,6 +20,7 @@ use std::ops::Add;
 /// #
 /// # let user = UserId(1);
 /// # let emoji = Emoji {
+/// #     animated: false,
 /// #     id: EmojiId(2),
 /// #     name: "test".to_string(),
 /// #     managed: false,
@@ -145,6 +146,7 @@ impl MessageBuilder {
     /// use serenity::utils::MessageBuilder;
     ///
     /// let emoji = Emoji {
+    ///     animated: false,
     ///     id: EmojiId(302516740095606785),
     ///     managed: true,
     ///     name: "smugAnimeFace".to_string(),