Remove exit flag on build script

Apparently on windows building with the -e (exit) flag set
will cause the console to exit rather than the script.

Since the script contains only one command, it seems reasonable to omit the
exit flag.

Author: kytrinyx

bin/build

@@ -1,5 +1,3 @@
 #!/bin/bash
 
 go build -o out/exercism exercism/main.go
-
-set -e