Support for completions

Cargo.lock

@@ -84,12 +84,20 @@ dependencies = [
  "bitflags",
  "clap_lex",
  "indexmap",
- "once_cell",
  "strsim",
  "termcolor",
  "textwrap",
 ]
 
+[[package]]
+name = "clap_complete"
+version = "3.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e4179da71abd56c26b54dd0c248cc081c1f43b0a1a7e8448e28e57a29baa993d"
+dependencies = [
+ "clap",
+]
+
 [[package]]
 name = "clap_lex"
 version = "0.2.4"
@@ -194,6 +202,7 @@ dependencies = [
  "ansi_term",
  "assert_cmd",
  "clap",
+ "clap_complete",
  "config-file",
  "directories",
  "lscolors",