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Upgrade to SpecialFunctions 0.8 #39

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Nov 6, 2019
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In version 0.8 of SpecialFunctions lgamma was split into loggamma and logabsgamma where the latter returns a tuple of the value and the sign. Similarly changes were made for lbeta. The old lgamma and lbeta used to return just the log of the absolute value of the argument which often was forgotten. That was also the case for the definitions here in DiffRules but luckily that means that the definitions become correct when we change lgamma to loggamma and lbeta to logbeta as this PR does. I plan to release version 0.1 once this PR has been merged since there are downstream packages waiting for this.

@andreasnoack andreasnoack merged commit 55d041a into master Nov 6, 2019
@andreasnoack andreasnoack deleted the an/specialfunctions08 branch November 6, 2019 22:00
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