Fix broken link to godepgraph (the URL scheme was missing so the link was treated as a relative).
diff --git a/CodeTools.md b/CodeTools.md
index 5b3a58f..33ed423 100644
--- a/CodeTools.md
+++ b/CodeTools.md
@@ -60,4 +60,4 @@
 
 ## Visualization
 
-  - [godegraph](github.com/kisielk/godepgraph) - A tool for generating dependency graphs of Go code.
+  - [godegraph](http://github.com/kisielk/godepgraph) - A tool for generating dependency graphs of Go code.