Remove support for `binaryen-as-dependency` (#251)

* Remove support for `binaryen-as-dependency`

* Add to changelog
5 jobs for master in 1 minute and 26 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Check
failed #894585
linux-docker
clippy

00:01:26

passed #894584
linux-docker
fmt

00:01:18

 
  Test
skipped #894586
linux-docker
test
skipped #894587
linux-docker
test-new-project-template
 
  Build
skipped #894588
linux-docker
build
 
Name Stage Failure
failed
clippy Check

error: aborting due to 3 previous errors

error: could not compile `cargo-contract`

Caused by:
process didn't exit successfully: `sccache /usr/local/rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/clippy-driver rustc --crate-name cargo_contract --edition=2018 src/main.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,metadata -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' -C metadata=58ee0978c56ba084 -C extra-filename=-58ee0978c56ba084 --out-dir /ci-cache/cargo-contract/targets/master/clippy/debug/deps -C incremental=/ci-cache/cargo-contract/targets/master/clippy/debug/incremental -L dependency=/ci-cache/cargo-contract/targets/master/clippy/debug/deps --extern anyhow=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libanyhow-f837c993019e8508.rmeta --extern blake2=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libblake2-db7a33d56cdbe813.rmeta --extern cargo_metadata=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libcargo_metadata-947a5c511c6046f5.rmeta --extern colored=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libcolored-23c76dd48b9f8968.rmeta --extern contract_metadata=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libcontract_metadata-104a659aa75ffe66.rmeta --extern env_logger=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libenv_logger-1a5bc9b5a19ff2bc.rmeta --extern funty=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libfunty-abb3727cea1719c3.rmeta --extern heck=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libheck-bbf477b1a5028305.rmeta --extern impl_serde=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libimpl_serde-6126d4c5e399c791.rmeta --extern log=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/liblog-fbe57397162df1aa.rmeta --extern codec=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libparity_scale_codec-431b4ec5f2b2de03.rmeta --extern parity_wasm=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libparity_wasm-a920a32277428996.rmeta --extern pwasm_utils=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libpwasm_utils-4c904b7aeb047ee9.rmeta --extern regex=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libregex-6db8dbd31a03a9a4.rmeta --extern rustc_version=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/librustc_version-12aa6b93dddf18f8.rmeta --extern semver=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libsemver-baf28366992472be.rmeta --extern serde=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libserde-f640f747c650b5ab.rmeta --extern serde_json=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libserde_json-a4223390b7f98863.rmeta --extern structopt=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libstructopt-8bcfdaa076461d6f.rmeta --extern tempfile=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libtempfile-f014cdb1b4939b0d.rmeta --extern toml=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libtoml-732b3a209e980daf.rmeta --extern url=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/liburl-88b0132e5b71ac69.rmeta --extern which=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libwhich-2b71d63ae344a03d.rmeta --extern zip=/ci-cache/cargo-contract/targets/master/clippy/debug/deps/libzip-3387d2c0b7babfaa.rmeta -C link-dead-code` (exit status: 1)
Cleaning up file based variables
ERROR: Job failed: exit code 1