Bump to v0.6.1 #284

Job	Run time
Build `oauth-credentials` on MSRV (1.0.0)	11s
Build `oauth-credentials` on MSRV (1.6.0)	12s
Test `oauth-credentials` (stable, serde)	15s
Build `oauth-credentials` on MSRV (1.36.0)	23s
Test `oauth1-request-derive` (stable)	40s
Test `oauth-credentials` (stable, std)	16s
Test `oauth1-request-derive` (beta)	39s
Test `oauth-credentials` (beta, serde)	22s
Test `oauth1-request-derive` (nightly)	37s
Rustfmt	7s
Test `oauth-credentials` (beta, std)	16s
Test `oauth-credentials` (nightly, serde)	25s
Test `oauth-credentials` (nightly, std)	20s
Check with `-Z minimal-versions`	26s
Test (stable, js)	1m 0s
Test (stable, js,derive)	49s
Test (stable, js,hmac-sha1)	49s
Test (beta, js)	44s
Test (beta, js,derive)	49s
Test (beta, js,hmac-sha1)	47s
Test (nightly, js)	48s
Test (nightly, js,derive)	48s
Test (nightly, js,hmac-sha1)	46s
Test (1.48.0, js)	1m 34s
Test (stable, js, wasm32-unknown-unknown)	30s
	14m 33s

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