Remove opentracing runtime dependency from tox.ini

Author: johananl

tox.ini

@@ -15,7 +15,6 @@ python =
 [testenv]
 deps =
   mypy,mypyinstalled: mypy~=0.711
-  opentracing-shim: opentracing
 
 setenv =
   mypy: MYPYPATH={toxinidir}/opentelemetry-api/src/
@@ -68,7 +67,6 @@ deps =
   flake8~=3.7
   isort~=4.3
   black>=19.3b0,==19.*
-  opentracing~=2.2
 
 commands_pre =
   pip install -e {toxinidir}/opentelemetry-api