Merge pull request #359 from CachetHQ/djdefi-composer-bump

Update composer version

Author: djdefi

Dockerfile

@@ -9,7 +9,7 @@ ARG archive_url
 ENV cachet_ver ${cachet_ver:-2.4}
 ENV archive_url ${archive_url:-https://github.com/cachethq/Cachet/archive/${cachet_ver}.tar.gz}
 
-ENV COMPOSER_VERSION 1.6.3
+ENV COMPOSER_VERSION 1.9.0
 
 RUN apk add --no-cache --update \
     postgresql-client \