remove unnecessary RUN

Dockerfile

@@ -9,7 +9,6 @@ RUN curl -L http://wordpress.org/wordpress-4.2.2.tar.gz | tar -xz --strip-compon
 RUN chown -R www-data.www-data /app/code
 
 ADD start.sh /app/code/start.sh
-RUN chmod +x /app/code/start.sh
 
 RUN curl -o /app/code/wp https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar 
 RUN chmod +x /app/code/wp