Release v0.1.8

[dak2]

Summary

• Bump version to 0.1.8
• Update CHANGELOG.md with v0.1.8 entry

Changes since v0.1.7

• while/until loop support to type inference (Add while/until loop support to type inference #46)
• Not operator (!) support to type inference (Add not operator (!) support to type inference #47)
• begin/rescue/ensure exception handling support to type inference (Add begin/rescue/ensure exception handling support #48)
• Keyword argument support to type inference (Add keyword argument support to type inference #49)
• Multiple assignment support to type inference (Add multiple assignment support to type inference #50)
• Resolve all Clippy warnings for cleaner, more idiomatic Rust (Resolve all Clippy warnings for idiomatic Rust #51)

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