[Snyk] Upgrade proj4 from 2.12.0 to 2.12.1

[jumpinjackie]

Snyk has created this PR to upgrade proj4 from 2.12.0 to 2.12.1.

: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.

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

• The recommended version was released on 2 days ago.

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[!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.

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[coveralls]

coverage: 64.24%. remained the same when pulling 6b160e10657ef72a20f1a34388c02aa0a7a62974 on snyk-upgrade-7f1d5cce6482ba3425e506824072ec5e into 8459fbd026e173b447228e7a689c95f027a4a8fb on master.