Exclude .vale.ini from .gitignore

- Without this, vale won't correctly detect where the styles are.

.gitignore

@@ -154,6 +154,7 @@
 !/.editorconfig
 !/.gitignore
 !/.yardopts
+!/.vale.ini
 !/CHANGELOG.md
 !/CONTRIBUTING.md
 !/Dockerfile

.vale.ini

@@ -0,0 +1,4 @@
+StylesPath = ./docs/vale-styles
+
+[*.md]
+BasedOnStyles = Homebrew