Accept single and double quotes in Gulp plugin

plugins/gulp/gulp.plugin.zsh

@@ -20,7 +20,7 @@
 # in the current directory.
 #
 function $$gulp_completion() {
-    compls=$(grep -Eo "gulp.task\(('(([a-zA-Z0-9]|-)*)',)" gulpfile.js 2>/dev/null | grep -Eo "'(([a-zA-Z0-9]|-)*)'" | sed s/"'"//g | sort)
+    compls=$(grep -Eo "gulp.task\((['\"](([a-zA-Z0-9]|-)*)['\"],)" gulpfile.js 2>/dev/null | grep -Eo "['\"](([a-zA-Z0-9]|-)*)['\"]" | sed s/"['\"]"//g | sort)"
 
     completions=(${=compls})
     compadd -- $completions