add rustfmt and clippy components to ramekin Dockerfile
diff --git a/.ramekin/Dockerfile b/.ramekin/Dockerfile
index 92b1a5e..3af3723 100644
--- a/.ramekin/Dockerfile
+++ b/.ramekin/Dockerfile
@@ -10,7 +10,7 @@ ENV RUSTUP_HOME=/usr/local/rustup \
PATH="/usr/local/cargo/bin:$PATH"
RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs \
| sh -s -- -y --default-toolchain nightly --profile minimal \
- && rustup component add llvm-tools-preview \
+ && rustup component add llvm-tools-preview rustfmt clippy \
&& cargo install grcov