Merge branch 'python-38-back' into 'master'

Re-enables python-3.8 builds

See merge request !469

conda_build_config.yaml

@@ -55,7 +55,7 @@ pin_run_as_build:
 
 ## the dependencies that we build against multiple versions
 python:
-  - 3.7
+  - 3.8
 
 zip_keys:
   -                             # [win]
@@ -96,7 +96,7 @@ libtiff:
 lzo:
   - 2.10
 mkl:
-  - 2019.4
+  - 2019.4.*
 mock:
   - 4.0.3
 numexpr: