Add filetype to gists

migrations/2019-05-01-185345_add_filetype_to_gists/down.sql

+ALTER TABLE gists DROP COLUMN filetype;

migrations/2019-05-01-185345_add_filetype_to_gists/up.sql

+ALTER TABLE gists ADD COLUMN filetype VARCHAR(255) DEFAULT NULL;

src/gists/mod.rs

     pub title: String,
     pub body: String,
     pub created_at: Option<NaiveDateTime>,
+    pub filetype: Option<String>,
 }
 
 #[derive(Insertable, AsChangeset, Serialize, Deserialize)]
 pub struct InsertableGist {
     pub title: String,
     pub body: String,
+    pub filetype: Option<String>,
 }
 
 pub fn all(connection: &PGC) -> QueryResult<Vec<Gist>> {

src/schema.rs

         title -> Varchar,
         body -> Text,
         created_at -> Nullable<Timestamp>,
+        filetype -> Nullable<Varchar>,
     }
 }