Fix pipeline failure (open-telemetry#1896)

Author: srikanthccv

tox.ini

@@ -123,7 +123,7 @@ commands_pre =
   test-core-proto: pip install {toxinidir}/opentelemetry-proto
   distro: pip install {toxinidir}/opentelemetry-python-contrib/opentelemetry-instrumentation {toxinidir}/opentelemetry-distro
 
-  getting-started: pip install -e {toxinidir}/opentelemetry-python-contrib/opentelemetry-instrumentation -e {toxinidir}/opentelemetry-python-contrib/instrumentation/opentelemetry-instrumentation-requests {toxinidir}/opentelemetry-python-contrib/util/opentelemetry-util-http -e {toxinidir}/opentelemetry-python-contrib/instrumentation/opentelemetry-instrumentation-wsgi -e {toxinidir}/opentelemetry-python-contrib/instrumentation/opentelemetry-instrumentation-flask
+  getting-started: pip install requests flask -e {toxinidir}/opentelemetry-python-contrib/opentelemetry-instrumentation -e {toxinidir}/opentelemetry-python-contrib/instrumentation/opentelemetry-instrumentation-requests {toxinidir}/opentelemetry-python-contrib/util/opentelemetry-util-http -e {toxinidir}/opentelemetry-python-contrib/instrumentation/opentelemetry-instrumentation-wsgi -e {toxinidir}/opentelemetry-python-contrib/instrumentation/opentelemetry-instrumentation-flask
 
   opencensus: pip install {toxinidir}/exporter/opentelemetry-exporter-opencensus