Upgrades stackage lts

Dockerfile

@@ -1,4 +1,4 @@
-FROM haskell:8.4.3 as builder
+FROM haskell:8.6.3 as builder
 WORKDIR /opt/hastatic
 ADD . .
 RUN stack install && strip /root/.local/bin/hastatic

hastatic.cabal

@@ -1,8 +1,10 @@
+cabal-version: 1.12
+
+-- This file has been generated from package.yaml by hpack version 0.31.0.
 --
 -- see: https://github.com/sol/hpack
 --
+-- hash: ba9f9972cbf781c5c6c1ad0f3553a49c517986eacf5908171f6618fbeab640ee
 
 name:           hastatic
 version:        0.9.0
@@ -13,7 +15,6 @@ copyright:      2018 Abhinav Sarkar
 license:        BSD3
 license-file:   LICENSE
 build-type:     Simple
-cabal-version:  >= 1.10
 extra-source-files:
     README.md
 

stack.yaml

@@ -1,4 +1,4 @@
-resolver: lts-12.7
+resolver: lts-13.2
 
 packages:
 - .