Add fixer for Go modules (#1873)

* Add fixer for Go modules

ale_linters/go/gobuild.vim

@@ -3,6 +3,7 @@
 " Description: go build for Go files
 " inspired by work from dzhou121 <dzhou121@gmail.com>
 
+call ale#Set('go_go_executable', 'go')
 call ale#Set('go_gobuild_options', '')
 
 function! ale_linters#go#gobuild#GetCommand(buffer) abort
@@ -10,7 +11,7 @@ function! ale_linters#go#gobuild#GetCommand(buffer) abort
 
     " Run go test in local directory with relative path
     return ale#path#BufferCdString(a:buffer)
-    \   . 'go test'
+    \   . ale#Var(a:buffer, 'go_go_executable') . ' test'
     \   . (!empty(l:options) ? ' ' . l:options : '')
     \   . ' -c -o /dev/null ./'
 endfunction
@@ -47,7 +48,7 @@ endfunction
 call ale#linter#Define('go', {
 \   'name': 'gobuild',
 \   'aliases': ['go build'],
-\   'executable': 'go',
+\   'executable_callback': ale#VarFunc('go_go_executable'),
 \   'command_callback': 'ale_linters#go#gobuild#GetCommand',
 \   'output_stream': 'stderr',
 \   'callback': 'ale_linters#go#gobuild#Handler',