Remove deprecated 'composer_name' setting

Author: kaste

linter.py

@@ -4,7 +4,6 @@
 class Phpcs(ComposerLinter):
     cmd = ('phpcs', '--report=emacs', '${args}', '-')
     regex = r'^.*:(?P<line>[0-9]+):(?P<col>[0-9]+): (?:(?P<error>error)|(?P<warning>warning)) - (?P<message>.+)'
-    composer_name = 'phpcs'
     defaults = {
         'selector': 'source.php - text.blade, text.html.basic',
         # we want auto-substitution of the filename, but `cmd` does not support that yet