v1.6.0

• migrate to github actions, codecov and maven central #49
• add indexOf (thx @hlyakhovich) #48
• add toShortArray (thx @hlyakhovich) #44
• add from() constructor from short vararg or array (thx @hlyakhovich) #45
• add an automatic module name to support the JPMS (thx @airsquared) #47
• fix warning of junit 4.13 CVE-2020-15250