Features from optional dependencies

env_logger implicit feature

Enables env_logger ^0.10

env_logger:

A logging implementation for log which is configured via an environment variable

Required by the binary

structopt implicit feature

Enables structopt

structopt:

Parse command line argument by defining a struct

Required by the binary

wasmprinter implicit feature

Enables wasmprinter ^0.2.60

wasmprinter:

Rust converter from the WebAssembly binary format to the text format