Bump ci's version (#138)

Author: heavenshell

.github/workflows/linux_neovim.yml

@@ -8,11 +8,11 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        name: [neovim-v04-x64]
+        name: [neovim-v05-x64]
         include:
-          - name: neovim-v04-x64
+          - name: neovim-v05-x64
             os: ubuntu-latest
-            neovim_version: v0.4.3
+            neovim_version: v0.5.0
     runs-on: ${{matrix.os}}
     steps:
       - uses: actions/checkout@v2