change entropy coder from Range to rANS

Cargo.lock

@@ -2,6 +2,12 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "anyhow"
+version = "1.0.47"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38d9ff5d688f1c13395289f67db01d4826b46dd694e7580accdc3e8430f2d98e"
+
 [[package]]
 name = "autocfg"
 version = "1.0.1"
@@ -33,6 +39,12 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "pico-args"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db8bcd96cb740d03149cbad5518db9fd87126a10ab519c011893b1754134c468"
+
 [[package]]
 name = "sacabase"
 version = "2.0.0"
@@ -46,5 +58,7 @@ dependencies = [
 name = "upkr"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
  "cdivsufsort",
+ "pico-args",
 ]