Quality improvement: documentation, code style, lint, coverage

Refractor Object decoder

Author: jvmvik

Makefile

@@ -1,5 +1,12 @@
 # Automate pip package development
 #
+# Usage
+# To release a package.
+# - update version in serpapi/_version.py
+# - review README version
+# - run 
+# $ make release
+
 # current version
 version=$(shell grep version setup.py | cut -d"'" -f2)
 dist=dist/serpapi-$(version).tar.gz
@@ -21,12 +28,17 @@ lint:
 test:
 	pytest --cov=serpapi --cov-report html tests/*.py
 
+# install dependencies
+# 
 # pytest-cov - code coverage extension for pytest
 # sphinx - documentation
+# twine - release automation
 install:
 	pip3 install -U setuptools
 	pip3 install -r requirements.txt
+	pip3 install pylint
 	pip3 install pytest-cov
+	pip3 install twine
 	pip3 install sphinx
 
 readme:
@@ -36,14 +48,15 @@ doc: readme
 	$(MAKE) -C docs/ html
 
 # https://packaging.python.org/tutorials/packaging-projects/
-build: doc test
+build: doc lint test
 	python3 setup.py sdist
 
 # out of box testing / user acceptance before delivery
 oobt: build
 	pip3 install ./${dist}
 	python3 oobt/oobt.py
 
+
 check: oobt
 	twine check ${dist}