v1.16.3

ADDED:
* envs.MustEnv(), envs.MustEnvNoBlank()

UPDATED:
* dep mods, Go version

paths/TODO

@@ -1,8 +1,10 @@
+
 - search criteria should *also* support a timestamp range (e.g. so a search can be restricted to both older than AND newer than; e.g. older than 00:00, newer than 01:00)
 
 - need an ExpandHomeSys (...which will change ExpandHome behavior, if it switches to path instead of path/filepath...)
 -- Should probably split out to a separate module or branch to v2.
--- separate module:
+-- get rid of the *Sys stuff? Normalize all to os.PathSep? provide package-level bool to control behavior? 
+-- separate modules ideal:
 --- r00t2.io/paths/
                   <generic>
                   gopath/
@@ -10,3 +12,4 @@
                   syspath/
 			<os.PathSeparator>
 	I could consolidate a LOT of code if I use a struct that has a mode (or typed against different separators?) etc. but...
+--- Need to test with e.g. "network share paths" - URI format (<scheme>://<path>), \\host\share, etc.