Use cmark-gfm 0.2.0.

pandoc.cabal

@@ -401,7 +401,7 @@ library
                  deepseq >= 1.3 && < 1.5,
                  JuicyPixels >= 3.1.6.1 && < 3.4,
                  Glob >= 0.7 && < 0.11,
-                 cmark-gfm >= 0.1.8 && < 0.2,
+                 cmark-gfm >= 0.2 && < 0.3,
                  doctemplates >= 0.2.1 && < 0.3,
                  network-uri >= 2.6 && < 2.7,
                  network >= 2.6,

stack.yaml

@@ -16,7 +16,7 @@ extra-deps:
 - skylighting-core-0.7.7
 - ipynb-0.1
 - texmath-0.11.2.2
-- cmark-gfm-0.1.8
+- cmark-gfm-0.2.0
 ghc-options:
    "$locals": -Wall -fno-warn-unused-do-bind -Wincomplete-record-updates -Wnoncanonical-monad-instances -Wnoncanonical-monadfail-instances -Wincomplete-uni-patterns -Widentities -Wcpp-undef -fhide-source-paths
 resolver: lts-13.9