refactor: github palette

lib/screens/commits.dart

@@ -72,9 +72,9 @@ class CommitsScreen extends StatelessWidget {
     var size = 18.0;
     switch (state) {
       case 'SUCCESS':
-        return Icon(Octicons.check, color: PrimerColors.green500, size: size);
+        return Icon(Octicons.check, color: GithubPalette.open, size: size);
       case 'FAILURE':
-        return Icon(Octicons.x, color: PrimerColors.red600, size: size);
+        return Icon(Octicons.x, color: GithubPalette.closed, size: size);
       default:
         return Container();
     }

lib/utils/utils.dart

@@ -87,7 +87,9 @@ Tuple2<String, String> parseRepositoryFullName(String fullName) {
 }
 
 class GithubPalette {
-  static const green = Color(0xff2cbe4e);
+  static const open = Color(0xff2cbe4e);
+  static const closed = PrimerColors.red600;
+  static const merged = PrimerColors.purple500;
 }
 
 // final pageSize = 5;

lib/widgets/issue_item.dart

@@ -65,7 +65,7 @@ class IssueItem extends StatelessWidget {
                     isPullRequest
                         ? Octicons.git_pull_request
                         : Octicons.issue_opened,
-                    color: GithubPalette.green,
+                    color: GithubPalette.open,
                     size: 18),
                 SizedBox(width: 6),
                 Expanded(

lib/widgets/notification_item.dart

@@ -37,9 +37,9 @@ class _NotificationItemState extends State<NotificationItem> {
       case 'Issue':
         switch (payload.state) {
           case 'OPEN':
-            return _buildIcon(Octicons.issue_opened, GithubPalette.green);
+            return _buildIcon(Octicons.issue_opened, GithubPalette.open);
           case 'CLOSED':
-            return _buildIcon(Octicons.issue_closed, PrimerColors.red600);
+            return _buildIcon(Octicons.issue_closed, GithubPalette.closed);
           default:
             return _buildIcon(Octicons.person);
         }
@@ -47,11 +47,11 @@ class _NotificationItemState extends State<NotificationItem> {
       case 'PullRequest':
         switch (payload.state) {
           case 'OPEN':
-            return _buildIcon(Octicons.git_pull_request, GithubPalette.green);
+            return _buildIcon(Octicons.git_pull_request, GithubPalette.open);
           case 'CLOSED':
-            return _buildIcon(Octicons.git_pull_request, PrimerColors.red600);
+            return _buildIcon(Octicons.git_pull_request, GithubPalette.closed);
           case 'MERGED':
-            return _buildIcon(Octicons.git_merge, PrimerColors.purple500);
+            return _buildIcon(Octicons.git_merge, GithubPalette.merged);
           default:
             return _buildIcon(Octicons.person);
         }

lib/widgets/timeline_item.dart

@@ -113,7 +113,7 @@ class TimelineItem extends StatelessWidget {
         return TimelineEventItem(
           actor: payload['actor']['login'],
           iconData: Octicons.primitive_dot,
-          iconColor: GithubPalette.green,
+          iconColor: GithubPalette.open,
           textSpan: TextSpan(
               text: ' referenced this on #' +
                   payload['source']['number'].toString()),
@@ -123,7 +123,7 @@ class TimelineItem extends StatelessWidget {
         return TimelineEventItem(
           actor: payload['actor']['login'],
           iconData: Octicons.circle_slash,
-          iconColor: PrimerColors.red600,
+          iconColor: GithubPalette.closed,
           textSpan: TextSpan(text: ' closed this '),
           item: payload,
         );
@@ -132,7 +132,7 @@ class TimelineItem extends StatelessWidget {
         return TimelineEventItem(
           actor: payload['actor']['login'],
           iconData: Octicons.primitive_dot,
-          iconColor: GithubPalette.green,
+          iconColor: GithubPalette.open,
           textSpan: TextSpan(text: ' reopened this '),
           item: payload,
         );
@@ -246,7 +246,7 @@ class TimelineItem extends StatelessWidget {
       case 'PullRequestReview':
         return TimelineEventItem(
           actor: payload['author']['login'],
-          iconColor: PrimerColors.green500,
+          iconColor: GithubPalette.open,
           iconData: Octicons.check,
           textSpan: _buildReviewText(context, payload),
           item: payload,
@@ -258,7 +258,7 @@ class TimelineItem extends StatelessWidget {
         return TimelineEventItem(
           actor: payload['actor']['login'],
           iconData: Octicons.git_merge,
-          iconColor: PrimerColors.purple500,
+          iconColor: GithubPalette.merged,
           textSpan: TextSpan(children: [
             TextSpan(text: ' merged commit '),
             TextSpan(text: payload['commit']['oid'].substring(0, 8)),