[ travis ] test ghc 8.10 compilation

Also include GHC == 8.10.1 in the 'tested-with:' field.

Author: andreasabel

.travis.yml

@@ -11,7 +11,8 @@ env:
  - GHCVER=8.2.2
  - GHCVER=8.4.4
  - GHCVER=8.6.5
- - GHCVER=8.8.2
+ - GHCVER=8.8.3
+ - GHCVER=8.10.1
 
 before_install:
  - sudo add-apt-repository -y ppa:hvr/ghc

alex.cabal

@@ -32,7 +32,8 @@ tested-with:
         GHC == 8.2.2
         GHC == 8.4.4
         GHC == 8.6.5
-        GHC == 8.8.2
+        GHC == 8.8.3
+        GHC == 8.10.1
 
 data-dir: data/