Fixed requests installation

Dockerfile

@@ -8,8 +8,12 @@ WORKDIR /tmp
 COPY apt.txt /tmp/apt.txt
 RUN apt-get update &&\
     apt-get install -y $(grep -vE "^\s*#" apt.txt  | tr "\n" " ") &&\
-    ln -s /usr/bin/nodejs /usr/bin/node &&\
-    pip install pip --upgrade
+    ln -s /usr/bin/nodejs /usr/bin/node
+
+# Install pip
+RUN curl --silent --location https://bootstrap.pypa.io/get-pip.py > get-pip.py &&\
+    python3 get-pip.py &&\
+    python get-pip.py
 
 # Add non-root user.
 RUN adduser --disabled-password --gecos "" mitodl

apt.txt

@@ -1,9 +1,8 @@
 # Core requirements
 
+curl
 git
 libpq-dev
-python-pip
-python3-pip
 python-dev
 python3-dev
 npm