feat(python38): add ubuntu-20.04 & fedora-32 for master only

* Upstream `master` branch is now Sodium `3001`
* Upstream issue resolved for `Python 3.8 Support`:
  - saltstack/salt#55310

.travis.yml

@@ -55,6 +55,7 @@ env:
     # Fedora has no python3 packages due to a tornado issue,
     # but they ship with Python3 since 29, so we install it using git
     # https://bugzilla.redhat.com/show_bug.cgi?id=1723207
+    - DN=fedora         DV=32     PI=dnf SIM=git    SV=master PV=3 EP="python3-pip"
     - DN=fedora         DV=31     PI=dnf SIM=git    SV=master PV=3 EP="python3-pip"
     - DN=fedora         DV=31     PI=dnf SIM=git    SV=3000.3 PV=3 EP="python3-pip"
     - DN=fedora         DV=31     PI=dnf SIM=git    SV=2019.2 PV=3 EP="python3-pip"
@@ -65,6 +66,7 @@ env:
     - DN=opensuse/leap  DV=15.1   PI=zyp SIM=git    SV=2019.2 PV=3 EP="python3-pip"
 
     # UBUNTU
+    - DN=ubuntu         DV=20.04  PI=apt SIM=git    SV=master PV=3 EP="python3-apt python3-pip"
     - DN=ubuntu         DV=18.04  PI=apt SIM=git    SV=master PV=3 EP="python3-apt python3-pip"
     - DN=ubuntu         DV=18.04  PI=apt SIM=stable SV=3000.3 PV=3 EP="python3-pip"
     - DN=ubuntu         DV=18.04  PI=apt SIM=stable SV=3000.3 PV=2 EP="python-pip"

test/integration/test_salt_version.py

@@ -1,7 +1,7 @@
 def test_salt_version(host, saltvers):
     cmd = host.run("salt-call --version")
     if saltvers in ["latest", "master"]:
-        saltvers = "3000"
+        saltvers = "3001"
     assert saltvers in cmd.stdout
     assert cmd.rc == 0