[Dockerfile] Clean up dated comment
diff --git a/Dockerfile b/Dockerfile
index 533b395..0d71868 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,8 +6,6 @@
# Please note that it'll use about 1.2 GB disk space and about 15 minutes to
# build this image, it depends on your hardware.
-# Use Ubuntu Trusty Tahr as base image as we're using on Travis CI
-# I also tested with Ubuntu 16.04, should be good with it!
FROM ubuntu:16.04
LABEL maintainer="Peter Dave Hello <hsu@peterdavehello.org>"
LABEL name="nvm-dev-env"
@@ -66,7 +64,6 @@
bash-completion && \
apt-get clean
-# ShellCheck with Ubuntu 14.04 container workaround
RUN wget https://github.com/koalaman/shellcheck/releases/download/v$SHELLCHECK_VERSION/shellcheck-v$SHELLCHECK_VERSION.linux.x86_64.tar.xz -O- | \
tar xJvf - shellcheck-v$SHELLCHECK_VERSION/shellcheck && \
mv shellcheck-v$SHELLCHECK_VERSION/shellcheck /bin && \
