Remove unused --lang argument

CHANGELOG.md

@@ -7,6 +7,10 @@ matching of delimiters in Clojure, Elisp and JSX.
 
 JSON (legacy parser): fixed parsing string literals (broken in 0.7).
 
+### Command Line Interface
+
+Removed the unused `--lang` argument.
+
 ## 0.7
 
 ### Git integration

src/main.rs

@@ -40,12 +40,6 @@ fn parse_args() -> (String, String, String) {
         .version(VERSION)
         .about("A syntax aware diff.")
         .author("Wilfred Hughes")
-        .arg(
-            Arg::with_name("LANGUAGE")
-                .long("lang")
-                .takes_value(true)
-                .help("Override the language parser"),
-        )
         .arg(Arg::with_name("positional_args").multiple(true))
         .setting(AppSettings::ArgRequiredElseHelp)
         .get_matches();