Bump to v0.6.1 #282

Job	Run time
Rustfmt	3s
Test `oauth1-request-derive` (stable)	19s
Build `oauth-credentials` on MSRV (1.0.0)	18s
Test `oauth-credentials` (stable, serde)	16s
Build `oauth-credentials` on MSRV (1.6.0)	11s
Test `oauth-credentials` (stable, std)	10s
Check with `-Z minimal-versions`	7s
Build `oauth-credentials` on MSRV (1.36.0)	20s
Test `oauth-credentials` (beta, serde)	16s
Test `oauth1-request-derive` (beta)	37s
Test `oauth1-request-derive` (nightly)	38s
Test `oauth-credentials` (beta, std)	16s
Test (stable, js)	20s
Test `oauth-credentials` (nightly, serde)	19s
Test (stable, js,derive)	27s
Test `oauth-credentials` (nightly, std)	17s
Test (stable, js,hmac-sha1)	17s
Test (beta, js)	34s
Test (beta, js,derive)	27s
Test (beta, js,hmac-sha1)	25s
Test (nightly, js)	23s
Test (nightly, js,derive)	24s
Test (nightly, js,hmac-sha1)	25s
Test (1.48.0, js)	13s
Test (stable, js, wasm32-unknown-unknown)	12s
	8m 14s

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