[Snyk] Security upgrade request-promise from 4.2.2 to 4.2.6

[trasherdk]

This PR was automatically created by Snyk using the credentials of a real user.

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

#### Changes included in this PR - Changes to the following files to upgrade the vulnerable dependencies to a fixed version: - package.json

⚠️ Warning

``` Failed to update the package-lock.json, please update manually before merging. ```

#### Vulnerabilities that will be fixed ##### With an upgrade: Severity | Priority Score (*) | Issue | Breaking Change | Exploit Maturity :-------------------------:|-------------------------|:-------------------------|:-------------------------|:-------------------------  | **768/1000**
**Why?** Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 7.5 | Prototype Pollution
[SNYK-JS-LODASH-6139239](https://snyk.io/vuln/SNYK-JS-LODASH-6139239) | No | Proof of Concept (*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: request-promise

The new version differs by 28 commits.

• 4bc186d Version 4.2.6
• 4c7d51d chore: bumped request-promise-core due to security vulnerability of lodash
• f364ee4 docs: reference to request deprecation and alternative libs
• 873d156 Merge pull request #341 from shisama/patch-1
• 052331d docs: deprecate this package
• b4dafe4 docs: fixed link
• fd52247 Version 4.2.5
• a27ba86 chore: updated request-promise-core that updates lodash
• 4e3b7ed Version 4.2.4
• 94be6fe fix: tough-cookie version
• 03f7030 chore: updated publish-please config
• d831905 Version 4.2.3 (now really)
• 37e8773 fix: updated indirect lodash dependency to fix security vulnerability
• 229225e Version 4.2.3
• 4f27097 chore: fix ci build for node v8+
• c535eb6 Merge pull request #299 from aomdoa/fixToughCookieDep
• 488947b Merge branch 'master' into fixToughCookieDep
• 131abd7 fix: breaking change in tough-cookie v3
• b454ddc chore: added node 8 and 10 to ci build
• 6d11ddc fix: typo
• 3a136ea Merge pull request #303 from lexjacobs/patch-1
• 5e32191 docs: mention of wrapped request errors
• 2ac4f3e Update rp.js
• 1457338 Workaround on the cookie processing test.

See the full diff

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