Get diff from minified files.
go get github.com/Rudolph-Miller/minified-diff
$GOPATH/bin/minified-diff test/lodash_4_0_0.min.js test/lodash_4_0_1.min.js
$ cat test/sample1
sample
text1
$ cat test/sample2
sample
text2
$ minified-diff test/sample1 test/sample2
sample
-text1
+text2
$ minified-diff test/sample1 test/sample2 | grep '^+'
text2