Update Dockerfile to use most current version of MkDocs (1.2.2) (#55)

Author: owenfiscus

Dockerfile

@@ -1,6 +1,6 @@
 FROM alpine:latest
 
-ENV MKDOCS_VERSION=1.1.2 \
+ENV MKDOCS_VERSION=1.2.2 \
     DOCS_DIRECTORY='/mkdocs' \
     LIVE_RELOAD_SUPPORT='false' \
     ADD_MODULES='false' \
@@ -29,4 +29,4 @@ RUN \
     rm -rf /tmp/* /var/tmp/* /var/cache/apk/* /var/cache/distfiles/* && \
     chmod 600 /root/.ssh/config
 
-CMD ["/usr/bin/bootstrap", "start"]
+CMD ["/usr/bin/bootstrap", "start"]