Bump to v0.6.1 #278

Job	Run time
Rustfmt	6s
Build `oauth-credentials` on MSRV (1.0.0)	15s
Test `oauth1-request-derive` (stable)	34s
Build `oauth-credentials` on MSRV (1.6.0)	17s
Test `oauth-credentials` (stable, serde)	33s
Test `oauth1-request-derive` (beta)	44s
Build `oauth-credentials` on MSRV (1.36.0)	24s
Check with `-Z minimal-versions`	49s
Test `oauth-credentials` (stable, std)	36s
Test `oauth1-request-derive` (nightly)	40s
Test `oauth-credentials` (beta, serde)	21s
Test `oauth-credentials` (beta, std)	18s
Test (stable, js)	53s
Test `oauth-credentials` (nightly, serde)	17s
Test (stable, js,derive)	56s
Test `oauth-credentials` (nightly, std)	19s
Test (stable, js,hmac-sha1)	50s
Test (beta, js)	50s
Test (beta, js,derive)	58s
Test (beta, js,hmac-sha1)	50s
Test (nightly, js)	58s
Test (nightly, js,derive)	59s
Test (nightly, js,hmac-sha1)	51s
Test (1.48.0, js)	1m 20s
Test (1.48.0, js,derive)	1m 20s
Test (1.48.0, js,hmac-sha1)	1m 22s
Test (stable, js, wasm32-unknown-unknown)	27s
	18m 47s

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