Remove unused dependency: certifi

Signed-off-by: gdrosos <[email protected]>

Author: gdrosos

setup.py

@@ -43,7 +43,6 @@
       python_requires=">=3.7",
       install_requires=['autowrapt>=1.0',
                         'basictracer>=3.1.0',
-                        'certifi>=2018.4.16',
                         'fysom>=2.1.2',
                         'opentracing>=2.3.0',
                         'protobuf<5.0.0',