Fix error when vim-signify is not installed (#39)

README.md

@@ -48,8 +48,9 @@ Configuration
 By default, [vim-airline](https://github.com/bling/vim-airline),
 [vim-powerline](https://github.com/Lokaltog/vim-powerline),
 [powerline](https://github.com/Lokaltog/powerline),
-[lightline.vim](https://github.com/itchyny/lightline.vim), and
-[vim-gitgutter](https://github.com/airblade/vim-gitgutter) are temporarily
+[lightline.vim](https://github.com/itchyny/lightline.vim),
+[vim-signify](https://github.com/mhinz/vim-signify),
+and [vim-gitgutter](https://github.com/airblade/vim-gitgutter) are temporarily
 disabled while in Goyo mode.
 
 If you have other plugins that you want to disable/enable, or if you want to

plugin/goyo.vim

@@ -286,7 +286,9 @@ function! s:goyo_off()
   endif
 
   if goyo_disabled_signify
-    silent! if !(b:sy.active)|SignifyToggle|endif
+    silent! if !b:sy.active
+      SignifyToggle
+    endif
   endif
 
   if goyo_disabled_airline && !exists("#airline")