fix: update license key in setup() to expected value by PyPi (#73)

Author: jfuss

setup.py

@@ -43,7 +43,7 @@ def read_version():
     author='Amazon Web Services',
     author_email='[email protected]',
     url='https://github.com/awslabs/aws-lambda-builders',
-    license=read('LICENSE'),
+    license='Apache License 2.0',
     packages=find_packages(exclude=('tests', 'docs')),
     keywords="AWS Lambda Functions Building",
     # Support Python 2.7 and 3.6 or greater