Update pip/README.md

pip/README.md

@@ -1,9 +1,8 @@
-
 ```Dockerfile
 FROM alpine:latest
 
-RUN apk add --no-cache tini py-pip curl gcc
-RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
-ENV PATH="/root/.cargo/bin:${PATH}"
-RUN PIP_BREAK_SYSTEM_PACKAGES=1 pip install mitmproxy
+ENV PIP_BREAK_SYSTEM_PACKAGES=1
+RUN apk add --no-cache tini py-pip
+
+RUN pip install -U pip
 ```