v6.7.1

Changes:

• a2fdff5 housekeeping: Release Akavache 6.7
• dfefb60 feature: Add bulk inserts for sqlite (#499) @glennawatson
• e4d7799 build(deps): bump System.Runtime.Extensions from 4.3.0 to 4.3.1 (#497)
• 9d0b172 build(deps): bump System.Net.Primitives from 4.3.0 to 4.3.1 (#498)