refactor the hardcoded constant and close opened file

there are some constant that are hardcoded into the code before in this commit those are at the top of the file for better code readability and there is a opened file that didn't close before in this commit that is closed

setup.py

@@ -1,10 +1,15 @@
 from setuptools import setup, find_packages
 from os import path
-
+AUTHOR = 'Jina AI'
+AUTHOR_EMAIL = 'hello@jina.ai'
+LICENSE = 'Apache 2.0'
+GITHUB_URL = 'https://github.com/jina-ai/vectordb/'
+DOWNLOAD_URL = 'https://github.com/jina-ai/vectordb/tags'
 try:
     pkg_name = 'vectordb'
     libinfo_py = path.join(pkg_name, '__init__.py')
-    libinfo_content = open(libinfo_py, 'r', encoding='utf-8').readlines()
+    with open(libinfo_py, 'r', encoding='utf-8') as f:
+        libinfo_content = f.readlines()
     version_line = [l.strip() for l in libinfo_content if l.startswith('__version__')][
         0
     ]
@@ -29,11 +34,11 @@
     description='The Python VectorDB. Build your vector database from working as a library to scaling as a database in the cloud',
     long_description=_long_description,
     long_description_content_type='text/markdown',
-    author='Jina AI',
-    author_email='hello@jina.ai',
-    license='Apache 2.0',
-    url='https://github.com/jina-ai/vectordb/',
-    download_url='https://github.com/jina-ai/vectordb/tags',
+    author= AUTHOR,
+    author_email=AUTHOR_EMAIL,
+    license=LICENSE,
+    url=GITHUB_URL,
+    download_url=DOWNLOAD_URL,
     packages=find_packages(),
     classifiers=[
         'Development Status :: 5 - Production/Stable',