Bump lodash from 4.17.5 to 4.17.20 in /tutorials/4-start

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.5 to 4.17.20.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.5...4.17.20)

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

tutorials/4-start/yarn.lock

@@ -441,7 +441,7 @@ babel-core@6.26.0, babel-core@^6.26.0:
 
 babel-eslint@^8.2.1:
   version "8.2.2"
-  resolved "http://registry.npmjs.org/babel-eslint/-/babel-eslint-8.2.2.tgz#1102273354c6f0b29b4ea28a65f97d122296b68b"
+  resolved "https://registry.npmjs.org/babel-eslint/-/babel-eslint-8.2.2.tgz#1102273354c6f0b29b4ea28a65f97d122296b68b"
   dependencies:
     "@babel/code-frame" "^7.0.0-beta.40"
     "@babel/traverse" "^7.0.0-beta.40"
@@ -3442,8 +3442,8 @@ locate-path@^2.0.0:
     path-exists "^3.0.0"
 
 lodash@^4.14.0, lodash@^4.17.4, lodash@^4.2.0, lodash@^4.3.0, lodash@^4.5.1:
-  version "4.17.5"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.5.tgz#99a92d65c0272debe8c96b6057bc8fbfa3bed511"
+  version "4.17.20"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.20.tgz#b44a9b6297bcb698f1c51a3545a2b3b368d59c52"
 
 longest@^1.0.1:
   version "1.0.1"