fix: required package name error

requirements.txt

@@ -1,11 +1,12 @@
 tornado>=4.3.0
-python-user-agents
+user-agents
 
 # extra support
 flask
 django
 aiohttp
 bokeh
+pandas
 
 # test requirements
 selenium==3.*

setup.py

@@ -77,7 +77,7 @@ setup(
     ],
     install_requires=[
         'tornado>=4.3.0',  # After this version, the new async/await keywords in Python 3.5 are supported
-        'python-user-agents',
+        'user-agents',
     ],
     extras_require=extras_require,
     project_urls={