Remove unused abort_on_panic crate.

Author: kinetiknz

mp4parse/Cargo.toml

@@ -25,7 +25,6 @@ travis-ci = { repository = "https://github.com/mozilla/mp4parse-rust" }
 
 [dependencies]
 byteorder = "1.2.1"
-abort_on_panic = { version = "1.0.0", optional = true }
 bitreader = { version = "0.3.2" }
 num-traits = "0.2.0"
 mp4parse_fallible = { version = "0.0.3", optional = true }