Start using Pipfile to manage dependencies

Pipfile

+[[source]]
+name = "pypi"
+url = "https://pypi.org/simple"
+verify_ssl = true
+
+[dev-packages]
+
+[packages]
+pyqtgraph = "*"
+numpy = "*"
+pyserial = "*"
+pyqt5 = "*"
+pyuic = "*"
+platformio = "*"
+
+[requires]
+python_version = "3.5"