Bump lodash from 4.17.4 to 4.17.19 in /client

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.4 to 4.17.19.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](https://github.com/lodash/lodash/compare/4.17.4...4.17.19)

Signed-off-by: dependabot[bot] <support@github.com>

client/package.json

@@ -42,7 +42,7 @@
     "cookie-parser": "^1.4.3",
     "express": "^4.15.2",
     "express-session": "^1.15.2",
-    "lodash": "^4.17.4",
+    "lodash": "^4.17.19",
     "lodash.throttle": "^4.1.1",
     "material-colors": "^1.2.5",
     "moment": "^2.18.0",

client/yarn.lock

@@ -3584,9 +3584,9 @@ lodash.uniq@^4.5.0:
   version "4.5.0"
   resolved "https://registry.yarnpkg.com/lodash.uniq/-/lodash.uniq-4.5.0.tgz#d0225373aeb652adc1bc82e4945339a842754773"
 
-"lodash@>=3.5 <5", lodash@^4.0.0, lodash@^4.11.2, lodash@^4.14.0, lodash@^4.16.4, lodash@^4.17.2, lodash@^4.17.3, lodash@^4.17.4, lodash@^4.3.0, lodash@~4.17.2, lodash@~4.17.4:
-  version "4.17.4"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.4.tgz#78203a4d1c328ae1d86dca6460e369b57f4055ae"
+"lodash@>=3.5 <5", lodash@^4.0.0, lodash@^4.11.2, lodash@^4.14.0, lodash@^4.16.4, lodash@^4.17.19, lodash@^4.17.2, lodash@^4.17.3, lodash@^4.17.4, lodash@^4.3.0, lodash@~4.17.2, lodash@~4.17.4:
+  version "4.17.19"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.19.tgz#e48ddedbe30b3321783c5b4301fbd353bc1e4a4b"
 
 longest@^1.0.1:
   version "1.0.1"