Update humantime to 2.0

Author: Eijebong

Cargo.toml

@@ -23,7 +23,7 @@ members = [
 log = { version = "0.4.8", features = ["std"] }
 regex = { version = "1.0.3", optional = true }
 termcolor = { version = "1.0.2", optional = true }
-humantime = { version = "1.3", optional = true }
+humantime = { version = "2.0.0", optional = true }
 atty = { version = "0.2.5", optional = true }
 
 [[test]]