Use last lts for ghc-8.8.3

Author: jneira

stack-8.8.3.yaml

@@ -1,4 +1,4 @@
-resolver: lts-15.10
+resolver: lts-15.12
 
 packages:
 - .
@@ -15,7 +15,6 @@ extra-deps:
 - ghc-check-0.3.0.1
 - ghc-lib-parser-8.10.1.20200412
 - ghc-lib-parser-ex-8.10.0.4
-- haddock-library-1.8.0
 - haskell-lsp-0.22.0.0
 - haskell-lsp-types-0.22.0.0
 - haskell-src-exts-1.21.1