Use setuptools_scm for versioning through git tags

setup.py

@@ -3,7 +3,6 @@ import setuptools
 
 setuptools.setup(
 	name = 'snscrape',
-	version = '0.2.0',
 	description = 'A social networking service scraper',
 	author = 'JustAnotherArchivist',
 	url = 'https://github.com/JustAnotherArchivist/snscrape',
@@ -13,6 +12,8 @@ setuptools.setup(
 		'Programming Language :: Python :: 3.6',
 	],
 	packages = ['snscrape', 'snscrape.modules'],
+	setup_requires = ['setuptools_scm'],
+	use_scm_version = True,
 	install_requires = ['requests[socks]', 'lxml', 'beautifulsoup4'],
 	entry_points = {
 		'console_scripts': [