Flow checker: go back to "flow check".

"flow status" is a lot faster but in recent versions of flow it prints
a progress spinner to stderr even when stderr is not pointing to a
terminal.

plugin/syntastic.vim

@@ -19,7 +19,7 @@ if has('reltime')
     lockvar! g:_SYNTASTIC_START
 endif
 
-let g:_SYNTASTIC_VERSION = '3.7.0-70'
+let g:_SYNTASTIC_VERSION = '3.7.0-71'
 lockvar g:_SYNTASTIC_VERSION
 
 " Sanity checks {{{1

syntax_checkers/javascript/flow.vim

@@ -34,7 +34,7 @@ function! SyntaxCheckers_javascript_flow_GetLocList() dict
     endif
 
     let makeprg = self.makeprgBuild({
-        \ 'exe': self.getExecEscaped() . ' status',
+        \ 'exe': self.getExecEscaped() . ' check',
         \ 'args_after': '--show-all-errors --json' })
 
     let errorformat =