Update wp to 5.2

Dockerfile

@@ -7,7 +7,7 @@ RUN apt-get update && \
 
 RUN mkdir -p /app/code
 WORKDIR /app/code
-RUN curl -L http://wordpress.org/wordpress-5.1.1.tar.gz | tar -xz --strip-components 1 -f -
+RUN curl -L http://wordpress.org/wordpress-5.2.tar.gz | tar -xz --strip-components 1 -f -
 RUN rm readme.html wp-admin/install.php wp-config-sample.php
 RUN mv /app/code/wp-content /app/code/wp-content-vanilla && ln -s /app/data/wp-content /app/code/wp-content
 RUN ln -s /app/data/htaccess /app/code/.htaccess