fix library

Author: hamelsmu

action.yml

@@ -3,7 +3,7 @@ description: Useful for remedying the problem of restricted access tokens, espec
 author: Hamel Husain
 inputs:
   APP_PEM:
-    description: string version of your PEM file used to authenticate as a GitHub App
+    description: a base64 encoded string version of your PEM file used to authenticate as a GitHub App.  You can apply this encoding in the terminal `cat key.pem | base64`
     required: true
   APP_ID:
     description: you GITHUB App ID.

prebuild.Dockerfile

@@ -4,7 +4,7 @@ RUN pip install \
     cryptography==2.6.1 \
     github3.py==1.3.0 \
     jwcrypto==0.6.0 \
-    jwt==0.6.1
+    pyjwt==1.7.1
 
 COPY token_getter.py app/
 COPY entrypoint.sh app/