enable cheapskate (jgm/cheapskate#33)

build-constraints.yaml

@@ -2334,8 +2334,8 @@ packages:
         - microlens-ghc
         - microlens-contra
         - shortcut-links < 0 # MonadFail
-        - cheapskate-highlight < 0 # cheapskate
-        - cheapskate-lucid < 0 # cheapskate
+        - cheapskate-highlight
+        - cheapskate-lucid
         - cmark-lucid
         - cmark-highlight < 0 # cmark-0.6
         - Spock-lucid < 0 # GHC 8.4 via Spock
@@ -2458,7 +2458,7 @@ packages:
         - core-text
 
     "Sean Hunt <scshunt@csclub.uwaterloo.ca @scshunt":
-        - cheapskate < 0 # MonadFail
+        - cheapskate
 
     "Ivan Miljenovic <Ivan.Miljenovic@gmail.com> @ivan-m":
         - fgl
@@ -3336,7 +3336,7 @@ packages:
 
     "Tom Nielsen <tanielsen@gmail.com> @glutamate":
         - plotlyhs
-        - inliterate < 0 # cheapskate
+        - inliterate
 
     "Hyunje Jun <me@noraesae.net> @noraesae":
         - line < 0 # via scotty
@@ -5736,7 +5736,6 @@ skipped-benchmarks:
     # These can also be checked for updates periodically.
     - o-clock # base-4.10 and time-1.8 via tiempo
     - minisat-solver # Cabal-2.2.0.1 via easyrender
-    - cmark-gfm # via cheapskate
 
     # Compilation failures
     - cipher-aes # https://github.com/vincenthz/hs-crypto-cipher/issues/46