updated home-brew formula

Author: magicmonty

bash-git-prompt.rb

@@ -16,9 +16,9 @@ def install
 
   def caveats; <<-EOS.undent
     You should add the following to your .bashrc (or equivalent):
-      if [ -f "$(brew --prefix)/opt/bash-git-prompt/share/gitprompt.sh" ]; then
+      if [ -f "$(brew --prefix bash-git-prompt)/share/gitprompt.sh" ]; then
         GIT_PROMPT_THEME=Default
-        source "$(brew --prefix)/opt/bash-git-prompt/share/gitprompt.sh"
+        source "$(brew --prefix bash-git-prompt)/share/gitprompt.sh"
       fi
     EOS
   end