message: Make wabt optional.
diff: @@ -26,7 +26,7 @@ errno = "0.2"
  fern = { version = "0.5", features = ["colored"], optional = true }
  log = "0.4"
  structopt = "0.3"
  -wabt = "0.9.1"
  +wabt = { version = "0.9.1", optional = true }
  wasmer-clif-backend = { path = "lib/clif-backend", optional = true }
  wasmer-singlepass-backend = { path = "lib/singlepass-backend", optional = true }
  wasmer-middleware-common = { path = "lib/middleware-common" }
  @@ -79,7 +79,7 @@ serde = { version = "1", features = ["derive"] } # used by the plugin example
  typetag = "0.1" # used by the plugin example
  [features]
  -default = ["fast-tests", "wasi", "backend-cranelift"]
  +default = ["fast-tests", "wasi", "backend-cranelift", "wabt"]
  "loader-kernel" = ["wasmer-kernel-loader"]
  debug = ["fern", "log/max_level_debug", "log/release_max_level_debug"]
  trace = ["fern", "log/max_level_trace", "log/release_max_level_trace"]
  