LITE-13600 Exclusion of tests dir from installed RQL package

Author: maxipavlovic

MANIFEST.in

@@ -2,3 +2,4 @@ include LICENSE
 include README.md
 include requirements/dev.txt
 include requirements/test.txt
+prune tests

setup.py

@@ -28,7 +28,7 @@ def read_file(name):
     tests_require=read_file('requirements/test.txt').splitlines(),
     setup_requires=['setuptools_scm', 'pytest-runner'],
     extras_require={
-        "drf": read_file('requirements/extra.txt').splitlines(),
+        'drf': read_file('requirements/extra.txt').splitlines(),
     },
     use_scm_version=True,