Add retweet link to announcement (#45)

* Add retweet link to announcement

* Move retweet link to right

* Add myself to contributors list

README.md

@@ -77,3 +77,4 @@ TWITTER_ACCESS_TOKEN_SECRET
 
 * [veelenga](https://github.com/veelenga) V. Elenhaupt - creator, maintainer
 * [hugoabonizio](https://github.com/hugoabonizio) Hugo Abonizio - contributor, maintainer
+* [lex111](https://github.com/lex111) Alexey Pyltsyn - contributor

src/views/announcement/_entry.slang

@@ -25,9 +25,12 @@ article.hentry
         a href="/announcements/#{ announcement.id }" title="#{announcement.created_at.try &.to_s "%b %d, %Y"}"
           = time_ago_in_words(announcement.created_at.not_nil!)
 
-    - if can_update?(announcement)
       span.actions
-        a href="/announcements/#{ announcement.id }/edit"
-          i.fa.fa-pencil
-        a href="/announcements/#{ announcement.id }?_method=delete" onclick="return confirm('Are you sure?');"
-          i.fa.fa-trash
+        - if can_update?(announcement)
+            a href="/announcements/#{ announcement.id }/edit"
+              i.fa.fa-pencil
+            a href="/announcements/#{ announcement.id }?_method=delete" onclick="return confirm('Are you sure?');"
+              i.fa.fa-trash
+
+        a href="https://twitter.com/share?text=#{announcement.title}&url=#{SITE.url}#{announcement.short_path}&via=crystallang_ann&related=crystallang_ann" target="_blank" title="Retweet"
+          i.fa.fa-retweet