Bump smallvec from 1.4.0 to 1.4.2

[dependabot-preview[bot]]

Bumps smallvec from 1.4.0 to 1.4.2.

Release notes

Sourced from smallvec's releases.

v1.4.2

• insert_many no longer leaks elements if the provided iterator panics (#213).
• The unstable const_generics and specialization features are updated to work with the most recent nightly Rust toolchain (#232).
• Internal code cleanup (#229, #231).

v1.4.1

• Don't allocate when the size of the element type is zero. Allocating zero bytes is undefined behavior. (#228)

Commits

• 9ae7076 Auto merge of #233 - mbrubeck:bump, r=jdm
• ba0f462 Version 1.4.2
• 87500c3 Auto merge of #232 - c410-f3r:patch-1, r=mbrubeck
• 0e23d2a Use min_const_generics
• f7e01ef Auto merge of #230 - Atul9:add-cargo-fmt-to-travis-config, r=mbrubeck
• f7c7157 Auto merge of #231 - Atul9:cargo-fmt, r=mbrubeck
• 7f7ac30 Format code using 'cargo fmt'
• b3fada1 Add cargo fmt to travis build config
• cce91ca Auto merge of #213 - mbrubeck:leak, r=jdm
• 8ddf613 Fix leak on panic in insert_many.
• Additional commits viewable in compare view

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