Bump Vim 8.1+ requirement.

Author: Kristijan Husak

.github/workflows/tests.yml

@@ -18,8 +18,6 @@ jobs:
             neovim: false
           - version: v8.1.2424
             neovim: false
-          - version: v8.0.1848
-            neovim: false
           - version: nightly
             neovim: true
           - version: stable

README.md

@@ -8,7 +8,7 @@ It allows simple navigation through databases and allows saving queries for late
 With nerd fonts:
 ![with-nerd-fonts](https://i.imgur.com/aXI5BTG.png)
 
-Tested on Linux, Mac and Windows, Vim 8+ and Neovim.
+Tested on Linux, Mac and Windows, Vim 8.1+ and Neovim.
 
 Features:
 * Navigate through multiple databases and it's tables and schemas