refactor(lib/getPluginName): remove redundant regex quantifiers (#250)

`{1}` is the same as not having it

Signed-off-by: Frazer Smith <[email protected]>

lib/getPluginName.js

@@ -1,6 +1,6 @@
 'use strict'
 
-const fpStackTracePattern = /at\s{1}(?:.*\.)?plugin\s{1}.*\n\s*(.*)/
+const fpStackTracePattern = /at\s(?:.*\.)?plugin\s.*\n\s*(.*)/
 const fileNamePattern = /(\w*(\.\w*)*)\..*/
 
 module.exports = function getPluginName (fn) {