v0.3.4

Optimisers v0.3.4

Diff since v0.3.3

Merged pull requests:

• Fix macro signature in docstring (#184) (@abhro)
• fix docs (#185) (@CarloLucibello)
• allow Functor 0.5 (#186) (@CarloLucibello)

Closed issues:

• Design (#1)
• convenience constructors (#11)
• Restructure is not type stable but could be made stable? (#177)
• AdamW optimizer implemented incorrectly - weight decay does not incorporate learning rate (#182)