diff --git a/yarn.lock b/yarn.lock
index 7a708b09..cb7b2c23 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -905,6 +905,13 @@
   resolved "https://registry.yarnpkg.com/@babel/preset-stage-0/-/preset-stage-0-7.0.0.tgz#999aaec79ee8f0a763042c68c06539c97c6e0646"
   integrity sha512-FBMd0IiARPtH5aaOFUVki6evHiJQiY0pFy7fizyRF7dtwc+el3nwpzvhb9qBNzceG1OIJModG1xpE0DDFjPXwA==
 
+"@babel/runtime@^7.5.5":
+  version "7.6.2"
+  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.6.2.tgz#c3d6e41b304ef10dcf13777a33e7694ec4a9a6dd"
+  integrity sha512-EXxN64agfUqqIGeEjI5dL5z0Sw0ZwWo1mLTi4mQowCZ42O59b7DRpZAnTC6OqdF28wMBMFKNb/4uFGrVaigSpg==
+  dependencies:
+    regenerator-runtime "^0.13.2"
+
 "@babel/template@^7.1.0", "@babel/template@^7.4.0", "@babel/template@^7.4.4":
   version "7.4.4"
   resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.4.4.tgz#f4b88d1225689a08f5bc3a17483545be9e4ed237"
@@ -953,6 +960,14 @@
   resolved "https://registry.yarnpkg.com/@hackmd/diff-match-patch/-/diff-match-patch-1.1.3.tgz#c9b06119934bb638e49df5a82bab5ce03b07104d"
   integrity sha512-n6drMSGRHzK33vc8qNhJmMwLYOrtWKugkJAFTETHEKew+E3KwEKhaR0TTHl1sgm5gujvdPPQRXAHC5EI81tMFA==
 
+"@hackmd/emojify.js@^2.1.0":
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/@hackmd/emojify.js/-/emojify.js-2.1.0.tgz#4555a7004679f75aa91ccec65eba3b3b8646b1ea"
+  integrity sha512-RmQXPGD/uGaa0w2qoc+y6ur+TpQhAr2aBOm2QDLBDMzOdhkdmh9MyadM2rtLGz6U3ZilPjkQYzs+gHm1BhwvtA==
+  dependencies:
+    "@babel/runtime" "^7.5.5"
+    core-js "^3.2.1"
+
 "@hackmd/idle-js@~1.0.1":
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/@hackmd/idle-js/-/idle-js-1.0.1.tgz#89079a76d9c7bda87029660a708e72fbb2be3605"
@@ -3425,6 +3440,11 @@ core-js@^2.0.0, core-js@^2.4.0, core-js@^2.5.0:
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.9.tgz#6b4b214620c834152e179323727fc19741b084f2"
   integrity sha512-HOpZf6eXmnl7la+cUdMnLvUxKNqLUzJvgIziQ0DiF3JwSImNphIqdGqzj6hIKyX04MmV0poclQ7+wjWvxQyR2A==
 
+core-js@^3.2.1:
+  version "3.2.1"
+  resolved "https://registry.yarnpkg.com/core-js/-/core-js-3.2.1.tgz#cd41f38534da6cc59f7db050fe67307de9868b09"
+  integrity sha512-Qa5XSVefSVPRxy2XfUC13WbvqkxhkwB3ve+pgCQveNgYzbM/UxZeu1dcOX/xr4UmfUd+muuvsaxilQzCyUurMw==
+
 core-util-is@1.0.2, core-util-is@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
@@ -4649,11 +4669,6 @@ emoji-regex@~6.1.0:
   resolved "https://registry.yarnpkg.com/emoji-regex/-/emoji-regex-6.1.3.tgz#ec79a3969b02d2ecf2b72254279bf99bc7a83932"
   integrity sha1-7HmjlpsC0uzytyJUJ5v5m8eoOTI=
 
-emojify.js@~1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/emojify.js/-/emojify.js-1.1.0.tgz#079fff223307c9007f570785e8e4935d5c398beb"
-  integrity sha1-B5//IjMHyQB/VweF6OSTXVw5i+s=
-
 emojis-list@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/emojis-list/-/emojis-list-2.1.0.tgz#4daa4d9db00f9819880c79fa457ae5b09a1fd389"
@@ -7880,6 +7895,11 @@ markdown-it-regexp@~0.4.0:
   resolved "https://registry.yarnpkg.com/markdown-it-regexp/-/markdown-it-regexp-0.4.0.tgz#d64d713eecec55ce4cfdeb321750ecc099e2c2dc"
   integrity sha1-1k1xPuzsVc5M/esyF1DswJniwtw=
 
+markdown-it-ruby@^0.1.1:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/markdown-it-ruby/-/markdown-it-ruby-0.1.1.tgz#6e2050a9b2c3275afc2844920d53cdffbbe12f78"
+  integrity sha1-biBQqbLDJ1r8KESSDVPN/7vhL3g=
+
 markdown-it-sub@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/markdown-it-sub/-/markdown-it-sub-1.0.0.tgz#375fd6026eae7ddcb012497f6411195ea1e3afe8"
@@ -10513,6 +10533,11 @@ regenerator-runtime@^0.11.0:
   resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.11.1.tgz#be05ad7f9bf7d22e056f9726cee5017fbf19e2e9"
   integrity sha512-MguG95oij0fC3QV3URf4V2SDYGJhJnJGqvIIgdECeODCT98wSWDAJ94SSuVpYQUoTcGUIL6L4yNB7j1DFFHSBg==
 
+regenerator-runtime@^0.13.2:
+  version "0.13.3"
+  resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.13.3.tgz#7cf6a77d8f5c6f60eb73c5fc1955b2ceb01e6bf5"
+  integrity sha512-naKIZz2GQ8JWh///G7L3X6LaQUAMp2lvb1rvwwsURe/VXwD6VMfr+/1NuNw3ag8v2kY1aQ/go5SNn79O9JU7yw==
+
 regenerator-transform@^0.10.0:
   version "0.10.1"
   resolved "https://registry.yarnpkg.com/regenerator-transform/-/regenerator-transform-0.10.1.tgz#1e4996837231da8b7f3cf4114d71b5691a0680dd"