2.0.0: New Prefix Support

💥 BREAKING CHANGES 💥

This release includes breaking changes to the way prefixes are supported, as well as slight adjustments to several method names.

1. Removed *Env suffix from some names
   • WithLookupEnv is now named WithLookup
   • MapLookupEnv is now named MapLookup
   • CompositeLookupEnv is now named CompositeLookup
2. Removed WithPrefix, WithPrefixHandling, SetPrefix, and NewWithPrefix.

   // OLD
   vary.New(vary.WithPrefix("MYAPP"))
   // or
   vary.New(vary.WithPrefix("MYAPP"), vary.WithPrefixHandling(vary.PrefixHandlingPrimary))
   
   // NEW
   vary.New(vary.WithLookup(
     vary.CompositeLookup(vary.PrefixedLookup("MYAPP_", os.LookupEnv), os.LookupEnv)))

   // OLD
   vary.New(vary.WithPrefix("MYAPP"), vary.WithPrefixHandling(vary.PrefixHandlingSecondary))
   
   // NEW
   vary.New(vary.WithLookup(
     vary.CompositeLookup(os.LookupEnv, vary.PrefixedLookup("MYAPP_", os.LookupEnv))))

   // OLD
   vary.New(vary.WithPrefix("MYAPP"), vary.WithPrefixHandling(vary.PrefixHandlingAlways))
   
   // NEW
   vary.New(vary.WithLookup(vary.PrefixedLookup("MYAPP_", os.LookupEnv)))

   • Notice the explicit inclusion of the trailing underscore (_) in the new code, as the underscore is no longer automatically inserted when using PrefixedLookup in order to provide more flexibility.

What's Changed

• Eliminate some code redundancies by @chadweimer in #10
• Added CompositeLookupEnv to allow adding multiple lookups by @chadweimer in #11
• BREAKING: Changed prefix support to leverage LookupEnvFunc by @chadweimer in #12

Full Changelog: v1.3.1...v2.0.0