Merge pull request #220 from stevemoser/patch-1

Add links to GNU guide

source/en/1.0.0/index.html.haml

@@ -15,6 +15,8 @@ version: 1.0.0
 - vandamme = "https://github.com/tech-angels/vandamme/"
 - iso = "http://www.iso.org/iso/home/standards/iso8601.htm"
 - ghr = "https://help.github.com/articles/creating-releases/"
+- gnustyle = "https://www.gnu.org/prep/standards/html_node/Style-of-Change-Logs.html#Style-of-Change-Logs"
+- gnunews = "https://www.gnu.org/prep/standards/html_node/NEWS-File.html#NEWS-File"
 
 .header
   .title
@@ -193,9 +195,9 @@ version: 1.0.0
     Is there a standard changelog format?
 
   %p
-    Not really. There's the GNU changelog style guide, or the two-
-    paragraph-long GNU NEWS file "guideline". Both are inadequate or
-    insufficient.
+    Not really. There's the #{link_to "GNU changelog style guide", 
+    gnustyle}, or the #{link_to "two-paragraph-long GNU NEWS file", gnunews}
+    "guideline". Both are inadequate or insufficient.
 
   %p
     This project aims to be