shrc: add path for ruby2.1 gem

shrc

@@ -31,6 +31,7 @@ __safe_add_path_l(){
 
 __safe_add_path_l "$HOME/.local/bin"
 __safe_add_path_l "$HOME/.local/lib/gems/bin"
+__safe_add_path_l "$HOME/.gem/ruby/2.1.0/bin"
 __safe_add_path_r "/c/mingw/bin"
 __safe_add_path_r "/c/mingw/msys/1.0/bin"