Merge pull request #1429 from PHPOffice/develop

[tony340202]

Merge 0.15 to master

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context.

Fixes # (issue)

Checklist:

• I have run composer run-script check --timeout=0 and no errors were reported
• The new code is covered by unit tests (check build/coverage for coverage report)
• I have update the documentation to describe the changes

[coveralls]

Coverage remained the same at 94.837% when pulling dfa2f36 on master into d09da0b on develop.