feat: add .cjs config file (#717)

Co-authored-by: Benjamin E. Coe <[email protected]>

Author: shirotech

lib/configuration.js

@@ -4,6 +4,7 @@ const { readFileSync } = require('fs')
 
 const CONFIGURATION_FILES = [
   '.versionrc',
+  '.versionrc.cjs',
   '.versionrc.json',
   '.versionrc.js'
 ]
@@ -14,7 +15,8 @@ module.exports.getConfiguration = function () {
   if (!configPath) {
     return config
   }
-  if (path.extname(configPath) === '.js') {
+  const ext = path.extname(configPath)
+  if (ext === '.js' || ext === '.cjs') {
     const jsConfiguration = require(configPath)
     if (typeof jsConfiguration === 'function') {
       config = jsConfiguration()