Makes it possible to use the prompt-toolkit dependency with Python 3.6

Author: alwx

changelog/5636.bugfix.rst renamed to changelog/5636.improvement.rst

@@ -64,7 +64,7 @@ name = "Miscellaneous internal changes"
 showcontent = false
 
 [tool.poetry.dependencies]
-python = "^3.6.1"
+python = "^3.6"
 boto3 = "^1.12"
 requests = "^2.23"
 matplotlib = ">=3.1,<3.3"
@@ -104,7 +104,10 @@ cloudpickle = ">=1.2,<1.4"
 multidict = "^4.6"
 aiohttp = "~3.6"
 questionary = "~1.5.1"
-prompt-toolkit = "^3.0.4"
+prompt-toolkit = [
+    {version = "^2.0", python = "3.6.0"},
+    {version = "^3.0.5", python = "^3.6.1"}
+]
 python-socketio = ">=4.4,<4.6"
 python-engineio = ">=3.11,<3.13"
 pydot = "~1.4"