Update README.md

Author: opiepj

README.md

@@ -47,8 +47,8 @@ module.exports = config;
 Once the build finishes, a child process is spawned firing both a python and node script.
 
 ### API
-* onBuildStart: **Array[]**, array of scripts to execute on the initial build. **Default: []**
-* onBuildEnd: **Array[]**, array of scripts to execute after files are emitted. **Default: []**
+* onBuildStart: **Array[ ]**, array of scripts to execute on the initial build. **Default: [ ]**
+* onBuildEnd: **Array[ ]**, array of scripts to execute after files are emitted. **Default: [ ]**
 * dev: **Boolean**, switch for development environments. This causes scripts to only execute once. Useful for running HMR on webpack-dev-server. **Default: false**
 
 Enjoy