Remove journal from required elements in reference field

[bryanwweber]

Closes #76

• Fixes We should not require the reference field #76.
• Tests updated
• Added entry into CHANGELOG.md

Changes proposed in this pull request:

• Remove journal from required elements in reference field

@pr-omethe-us/chemked

[bryanwweber]

Again, the tests are failing because of problems fixed in #77. Not sure why Appveyor didn't fail...

[kyleniemeyer]

Now that #77 is merged, can we trigger the tests to run again here?

[codecov]

Codecov Report

Merging #79 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #79   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines         851    851           
  Branches      202    202           
=====================================
  Hits          851    851

---

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[codecov]

Codecov Report

Merging #79 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #79   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines         851    851           
  Branches      202    202           
=====================================
  Hits          851    851

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e99096a...1c5b9ed. Read the comment docs.