Restructuring requirements.txt to remove dev dependencies

Author: vandyliu

gulpfile.js

@@ -39,6 +39,7 @@ const pythonToMove = [
   "./src/microbit/!(test)/**/*",
   "./src/*.py",
   "./src/common/*.py",
+  "./src/dev-requirements.txt",
   "./src/requirements.txt",
   "./src/templates/*.*"
 ];

src/dev-requirements.txt

@@ -0,0 +1,3 @@
+-r ./requirements.txt
+black==19.10b0
+pytest==5.0.1

src/requirements.txt

@@ -1,6 +1,4 @@
-black==19.10b0
 playsound==1.2.2
-pytest==5.0.1
 applicationinsights==0.11.9
 python-socketio==4.3.1
 requests==2.22.0