Set default-features = false for serde_with (#18) #74

Job	Run time
docs	31s
cfg-check	21s
clippy	24s
doctest	35s
feature-checks	41s
fmt	10s
no-std	22s
test ubuntu-latest stable --no-default-features	20s
wasm-unknown	25s
test ubuntu-latest stable	17s
wasm-wasi	23s
test ubuntu-latest stable --all-features	40s
test ubuntu-latest nightly --no-default-features	29s
test ubuntu-latest nightly	30s
test ubuntu-latest nightly --all-features	37s
test ubuntu-latest 1.79 --no-default-features	25s
test ubuntu-latest 1.79	25s
test windows-latest stable --no-default-features	2m 36s
test windows-latest stable	4m 0s
test windows-latest stable --all-features	2m 19s
test windows-latest nightly --no-default-features	1m 2s
test windows-latest nightly	59s
test windows-latest nightly --all-features	1m 13s
test windows-latest 1.79 --no-default-features	53s
test windows-latest 1.79	51s
	21m 28s

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