Bump the ALE version to 4.0.0

Author: w0rp

autoload/ale.vim

@@ -171,7 +171,7 @@ function! ale#Queue(delay, ...) abort
     endif
 endfunction
 
-let s:current_ale_version = [3, 3, 0]
+let s:current_ale_version = [4, 0, 0]
 
 " A function used to check for ALE features in files outside of the project.
 function! ale#Has(feature) abort

test/test_ale_has.vader

@@ -1,5 +1,5 @@
 Execute(Checks for versions below the current version should succeed):
-  AssertEqual 1, ale#Has('ale-3.3.0')
+  AssertEqual 1, ale#Has('ale-4.0.0')
   AssertEqual 1, ale#Has('ALE-2.2.1')
   AssertEqual 1, ale#Has('ALE-1.0.0')