Use dev version of texmath.

cabal.project

@@ -3,6 +3,11 @@ tests: True
 flags: +embed_data_files
 constraints: aeson >= 2.0.1.0
 
+source-repository-package
+  type: git
+  location: https://github.com/jgm/texmath
+  tag: c884291bc6ee0ac7fc28d180d248c3e3c7d6fc62
+
 source-repository-package
   type: git
   location: https://github.com/jgm/citeproc

stack.yaml

@@ -34,13 +34,14 @@ extra-deps:
 - commonmark-pandoc-0.2.1.2
 - ipynb-0.2
 - pandoc-types-1.22.2
-- texmath-0.12.5
 - commonmark-0.2.2
 - commonmark-extensions-0.2.3.1
 - doclayout-0.4
 - doctemplates-0.10.0.2
 - git: https://github.com/jgm/citeproc
   commit: 647c5d292bbb6d9a8d683bcae0ba129c65086901
+- git: https://github.com/jgm/texmath
+  commit: c884291bc6ee0ac7fc28d180d248c3e3c7d6fc62
 
 ghc-options:
    "$locals": -fhide-source-paths -Wno-missing-home-modules