[Snyk] Upgrade proj4 from 2.11.0 to 2.12.0

[jumpinjackie]

Snyk has created this PR to upgrade proj4 from 2.11.0 to 2.12.0.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

---

• The recommended version is 1 version ahead of your current version.

• The recommended version was released on 3 days ago.

---

[!IMPORTANT]

• Check the changes in this PR to ensure they won't cause issues with your project.
• This PR was automatically created by Snyk using the credentials of a real user.

---

Note: You are seeing this because you or someone else with access to this repository has authorized Snyk to open upgrade PRs.

For more information:

• 🧐 View latest project report
• 📜 Customise PR templates
• 🛠 Adjust upgrade PR settings
• 🔕 Ignore this dependency or unsubscribe from future upgrade PRs

[coveralls]

coverage: 64.24%. remained the same when pulling b397ab9d3b717333bd9e1c0fa5b09583f413514a on snyk-upgrade-31ee0c7aa15b1e606d9bbf1c752ff03c into 406bd01650fc2dad0e8e6b7a3339eba740ae0ccb on master.