build(deps): bump gatsby from 2.19.18 to 2.19.19

yarn.lock

@@ -8932,9 +8932,9 @@ gatsby-transformer-sharp@^2.3.3:
     sharp "^0.23.4"
 
 gatsby@^2.17.11:
-  version "2.19.18"
-  resolved "https://registry.yarnpkg.com/gatsby/-/gatsby-2.19.18.tgz#bc03a806eb577e056d66b7ab5f7ca50070fc14c7"
-  integrity sha512-DRVak6eh3vCrokdn1taibno9Z/I+XxaWcTdorGVXnS1TCOjXeWJ838f/i3bc+BuuSmoq1V3lOKfggyvtccF74w==
+  version "2.19.19"
+  resolved "https://registry.yarnpkg.com/gatsby/-/gatsby-2.19.19.tgz#8d4aa54e8c8da9cb38c5c7a15cfa358aec496f65"
+  integrity sha512-Is2s9qJ5p9fSzwhAf2LpKcv5l3/03Le3ZMJiU4ZOOauFhzLbsEIWK/Fu90GwnC8T7t9iWH3myI9NGh3a9+6cAQ==
   dependencies:
     "@babel/code-frame" "^7.5.5"
     "@babel/core" "^7.7.5"