Vendor dependencies for 0.3.0 release

vendor/inflections/README.md

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+# inflections
+A Rust library for transforming one style of string to another focused on high performance.
+
+Read the [documentation](https://docs.rs/inflections) for more.
+
+# Example
+```rust
+use inflections::Inflect;
+
+assert_eq!("Hello World".to_camel_case(), "helloWorld".to_owned());
+```