Remove neovim from test matrix

...as vimrunner and neovim are not compatible

.github/workflows/tests.yml

@@ -26,7 +26,8 @@ jobs:
         # cannot be read...
         # os: [ubuntu-latest, macos-latest, windows-latest]
         os: [ubuntu-latest, macos-latest]
-        neovim: [false, true]
+        neovim: [false]
+        # neovim: [false, true]
         # TODO: Test different flavours of Vim...
 
     runs-on: ${{ matrix.os }}

spec/spec_helper.rb

@@ -17,16 +17,16 @@ def runtime(script)
 
   module Platform
     # For tests use in order of priority:
-    # 1. neovim -- when installed
-    # 2. gvim   -- when available
-    # 3. vim    -- if possible
+    # 1. gvim   -- when available
+    # 2. vim    -- if possible
+    # nvim is not compatible with vimrunner, let's ignore it now
     def best_vim
       prefered_vims.find { |vim| suitable?(vim) } or raise NoSuitableVimError
     end
     private 
 
     def prefered_vims
-      %w( nvim ) + gvims + %w( vim )
+      gvims + %w( vim )
     end
   end