v0.1.7: Release 0.1.7

 * Fix. Free memory before use it in getnameinfo callback.
 * Add. Sunc DNS requests
 * Add. Support `uv_signal_start_oneshot`
 * Add. `cofs` module
 * Add. `remove` and `insert` methods to `List` class
 * Add. `class.super` function to implement inheritance.
 * Add. `os_homedir`,`os_gethostname`,`os_getenv`,`os_setenv`,`os_unsetenv` functions.