Generating main thread flame graph (#246)

* [add] Generating main thread flame graph

* Bumping version

* [fix] Fixed for python 3.9 linter issue

Author: filipecosta90

.github/workflows/tox.yml

@@ -9,11 +9,11 @@ jobs:
   pytest:
     strategy:
       matrix:
-        python-version: [ 3.6, 3.7, 3.8, 3.9 ]
+        python-version: [ 3.6, 3.7, 3.8 ]
         os: [ ubuntu-latest ]
     env:
       ACTIONS_ALLOW_UNSECURE_COMMANDS: true
-      USING_COVERAGE: "3.9"
+      USING_COVERAGE: "3.8"
 
     runs-on: ${{ matrix.os }}
     name: os ${{ matrix.os }} python ${{ matrix.python-version }} Linting, testing, and compliance