feat(gitlab: events): merge_request/approved and merge_request/unappr…

…oved (#34)

* new gitlab events: merge_request/approved and merge_request/unapproved

* removed unused consts

* removed more unused consts

* merge-request/approved: remove fields from embed & fix some strings

* merge-request/unapproved: remove fields from embed & fix some strings

lib/Gitlab/Events/merge_request-approved.js

@@ -0,0 +1,28 @@
+const EventResponse = require('../EventResponse');
+
+class MergeRequestApproved extends EventResponse {
+  constructor(...args) {
+    super(...args, {
+      description: 'This event gets fired when a merge request is approved',
+    });
+  }
+
+  embed(data) {
+    const mergeRequest = data.object_attributes;
+    return {
+      color: 0x149617,
+      title: `Approved merge request #${mergeRequest.iid}: \`${mergeRequest.title}\``,
+    };
+  }
+
+  text(data) {
+    const actor = data.user.name;
+    const issue = data.object_attributes;
+    return [
+      `🛠  **${actor}** approved merge request **#${issue.iid}** _${issue.title}_`,
+      `<${issue.url}>`,
+    ].join('\n');
+  }
+}
+
+module.exports = MergeRequestApproved;

lib/Gitlab/Events/merge_request-unapproved.js

@@ -0,0 +1,28 @@
+const EventResponse = require('../EventResponse');
+
+class MergeRequestUnapproved extends EventResponse {
+  constructor(...args) {
+    super(...args, {
+      description: 'This event gets fired when a merge request is unapproved',
+    });
+  }
+
+  embed(data) {
+    const mergeRequest = data.object_attributes;
+    return {
+      color: 0x149617,
+      title: `Unapproved merge request #${mergeRequest.iid}: \`${mergeRequest.title}\``,
+    };
+  }
+
+  text(data) {
+    const actor = data.user.name;
+    const issue = data.object_attributes;
+    return [
+      `🛠  **${actor}** unapproved merge request **#${issue.iid}** _${issue.title}_`,
+      `<${issue.url}>`,
+    ].join('\n');
+  }
+}
+
+module.exports = MergeRequestUnapproved;