0.3.9 Update libsecp256k1 to version 0.3.2

Update dependency libsecp256k1 to commit 0fa84f869d51e1b71113d81fcd518ebcee08709a (version 0.3.2)

0.3.8 API BREAK

BREAKS API:

For details see:
#36

0.3.7 API BREAK

Adds more documentation
Remove initializers on K1.ECDSA.NonRecoverable.Signature taking data and recoveryID, use compact: Compact init instead.
Remove recoverPublicKey method from K1.ECDSA.NonRecoverable.Signature, init a K1.ECDSA.Recoverable.Signature instead.
Add new method serialize:format on K1.ECDSA.Recoverable.Signature.Compact, also document that type.

0.3.6 Introduce link to documentation in README

Link to documentation at: https://swiftpackageindex.com/sajjon/k1/0.3.5/documentation/k1/k1/ecdsa

0.3.5 API BREAK

Various improvements to documentation with some API breakage

0.3.4

Keys are no longer typealiases, they are existentials (generated with gyb)

0.3.3 BREAKING API

Major API break, see #16 and README for details.

0.3.2

Third release of 0.3.0 - using libsecp256k1 0.3.0.

Added more tests for ECDH and KDF.

0.3.1

Second release of 0.3.0 - using libsecp256k1 0.3.0.

Added more test for ECDH x963

0.3.0

SemVer which follows the SemVer of the libsecp256k1 version which is used, which is 0.3.0