Fix branch in docs/make.jl

[JeffFessler]

This is another fix needed to get docs to build and deploy properly.

[coveralls]

Pull Request Test Coverage Report for Build 3308051643

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 80.374%

---

Totals
Change from base Build 3307557987:	0.0%
Covered Lines:	172
Relevant Lines:	214

---

💛 - Coveralls

[codecov]

Codecov Report

Base: 80.37% // Head: 80.37% // No change to project coverage 👍

Coverage data is based on head (c0153bb) compared to base (14ce178).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #61   +/-   ##
=======================================
  Coverage   80.37%   80.37%           
=======================================
  Files           8        8           
  Lines         214      214           
=======================================
  Hits          172      172           
  Misses         42       42           

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