v0.9.4

Changes:

• Fixed segfaults for badly formed DEX files (thanks @cryptax!)
• Added PangXie packer rules (thanks @cryptax!)
• Added DexProtector obfuscator rules (thanks @Jasi2169!)
• Updated Yara from 3.4.0 to 3.5.0 (thanks ME!)
• Fixed some typos, cleaned up code, the usual