argh_shared: change serde features to allow no_std use
#183
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The
argh_sharedcrate depends onserde, which usesstdin its default configuration. This makes it incompatible withno_stdcrates.As per the
serdedocs, addingdefault-features = falsemakes it supportno_std, and adding theallocfeature lets it opt back into memory allocation so it can still handleStrings and such, which is (probably) important here.This could probably also be accomplished by adding a default-on
stdfeature that could be turned off byno_stdusers, but sinceargh's stated goal is small code size it seemed like defaulting tono_std-compatibility was the sanest & simplest change.