Fix #1186 - Disable checking code with perl by default

autoload/ale/linter.vim

@@ -27,6 +27,7 @@ let s:default_ale_linters = {
 \   'csh': ['shell'],
 \   'go': ['gofmt', 'golint', 'go vet'],
 \   'help': [],
+\   'perl': ['perlcritic'],
 \   'python': ['flake8', 'mypy', 'pylint'],
 \   'rust': ['cargo'],
 \   'spec': [],

doc/ale-perl.txt

@@ -1,6 +1,11 @@
 ===============================================================================
 ALE Perl Integration                                         *ale-perl-options*
 
+ALE offers a few ways to check Perl code. Checking code with `perl` is
+disabled by default, as `perl` code cannot be checked without executing it.
+
+See |g:ale_linters|.
+
 
 ===============================================================================
 perl                                                            *ale-perl-perl*

doc/ale.txt

@@ -1031,6 +1031,7 @@ g:ale_linters                                                   *g:ale_linters*
   \   'csh': ['shell'],
   \   'go': ['gofmt', 'golint', 'go vet'],
   \   'help': [],
+  \   'perl': ['perlcritic'],
   \   'python': ['flake8', 'mypy', 'pylint'],
   \   'rust': ['cargo'],
   \   'spec': [],