message: bump RUST_VER to 1.38.0 so that cargo-dep install succeeds
diff: @@ -60,7 +60,7 @@ ARG uid=1000
  RUN useradd -ms /bin/bash -u $uid vcx
  USER vcx
  -ARG RUST_VER="1.36.0"
  +ARG RUST_VER="1.38.0"
  RUN curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain $RUST_VER
  ENV PATH /home/vcx/.cargo/bin:$PATH
  