do not apply the age prior by default

[moustakas]

Fix #125.

[github-actions[bot]]

Pull Request Test Coverage Report for Build 5514371473

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.02%) to 50.349%

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Files with Coverage Reduction	New Missed Lines	%
py/fastspecfit/continuum.py	2	72.02%
<!--	Total:	2		-->

Totals
Change from base Build 5152016368:	-0.02%
Covered Lines:	2235
Relevant Lines:	4439

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💛 - Coveralls