Bump version to 1.1.5 #81

Job	Run time
build_msrv_all_features	2m 14s
build_msrv	2m 11s
build_msrv (--features serde)	2m 11s
test_trybuild	37s
build_msrv (--features alloc)	2m 13s
build_no_std	21s
build (stable)	16s
build (stable, --features serde)	16s
build_msrv (--release --features serde,alloc)	2m 40s
build (stable, --features alloc)	16s
build (stable, --features proc-macro-crate)	18s
build (stable, --features serde,alloc,proc-macro-crate)	18s
build (stable, --release --features serde,alloc,proc-macro-crate)	48s
build (beta)	20s
build (beta, --features serde)	24s
build (beta, --features alloc)	21s
build (beta, --features proc-macro-crate)	22s
build (beta, --features serde,alloc,proc-macro-crate)	24s
build (beta, --release --features serde,alloc,proc-macro-crate)	46s
build (nightly)	21s
build (nightly, --features serde)	21s
build (nightly, --features alloc)	23s
build (nightly, --features proc-macro-crate)	24s
build (nightly, --features serde,alloc,proc-macro-crate)	24s
build (nightly, --release --features serde,alloc,proc-macro-crate)	48s
	19m 57s

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