Merge pull request #8 from f0rw4rd/master

Fix handling of certificates without Authority Key Identifier

Merge pull request #7 from f0rw4rd/master

Fixed bug in EC check

Merge pull request #6 from exploide/fixes

added --keep-serial option which stops altering the serial number

code improvements recommended by shellcheck

show usage message when no positional argument has been given

Merge pull request #5 from exploide/keep-issuer-name

added --keep-issuer-name option

do not verify self-signed certs

Merge pull request #3 from 057a3dd61f99517a3afea0051a49cb27994f94d/modify-authorityKeyIdentifier

Merge branch '057a3dd61f99517a3afea0051a49cb27994f94d-modify-authorityKeyIdentifier'

add fake ca case to test script

Modify authorityKeyIdentifier of the original certificate.