v0.1.3

Changelog:

Bugfix:

• fix find_function_addr not implemented for CleLoader
• fix warning message of unsupported functions when using CleLoader

Features:

• add ProcessState.is_syscall() to check if the current instruction is a syscall
  instruction (in the target architecture)
• add open function symbolic routine.

Behavior changes:

• a call to ProcessState.fetch_instruction will by default position the current_instruction to the one being fetched.
• a warning message now printed when executing a syscall