Rename EnvParams → EmscriptenParams

examples/invoke.rs

@@ -18,7 +18,7 @@ fn main() {
     // Intrepreter initialization.
     // It also initializes a default "env" module.
     let program = parity_wasm::ProgramInstance::with_emscripten_env(
-        interpreter::EnvParams {
+        interpreter::EmscriptenParams {
             total_stack: 128*1024,
             ..Default::default()
         }