Allow installation for python 3.6 (#51)

Author: EmilioPeJu

.github/workflows/code.yml

@@ -27,7 +27,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python: [cp27, cp37, cp38, cp39]
+        python: [cp27, cp36, cp37, cp38, cp39]
 
         exclude:
           # No cothread or asyncio for windows python 2.7 so doesn't work

setup.cfg

@@ -17,7 +17,7 @@ classifiers =
 
 [options]
 packages = softioc
-python_requires = >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*, !=3.6.*
+python_requires = >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*
 
 [options.entry_points]
 # Include a command line script
@@ -36,14 +36,14 @@ softioc =
 useful =
     cothread
     scipy
-    aioca >=1.1
+    aioca >=1.3
 # Dev and docs dependencies
 dev =
     pytest-cov    
     pytest-flake8
     sphinx-rtd-theme-github-versions; python_version > "3.0"
     pytest-asyncio; python_version > "3.0"
-    aioca; python_version > "3.0"
+    aioca >=1.3 ; python_version > "3.0"
     cothread; sys_platform != "win32"
     p4p