v1.3

yet this is most stable release, most comfortable for usage.

- added checks for lib path and pid
lib path check:

// lib path check
if (access(lib_path, F_OK) == -1) {
    die("[!] invalid library path");
}

pid check:

// pid check
if (kill(pid, 0) == -1) {
    die("[!] invalid pid");
}

- added compiler script

#!/bin/bash
gcc -o injector injector.c -ldl -Wall
mv injector build 

- little reararrangement of files in src directory

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full changelog: v1.2...v1.3

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