0.3.1 - 2022-11-04

Features

streaming lexer - Geal + goto-bus-stop, pull/115

To help improve performance and memory usage in the lexer, we are now
streaming all incoming tokens in the lexer implementation.
extend ast::*Value node conversions - SimonSapin, pull/344

The following node types implement conversion to standard types, extracting
their value:
- StringValue → String
- IntValue → i32
- FloatValue → f64
- BoolValue → bool
These conversions are now also available:
- Through the From trait, not just the Into trait
- With borrowed nodes, not just owned
Example:
```
let node: &apollo_parser::ast::StringValue = /* something */;
let value: String = node.clone().into(); // before
let value = String::from(node); // now also possible
```

example of modifying queries with parser + encoder - lrlna, pull/346
An addition to apollo-parser's example directory encoding various parts of the AST using apollo-encoder's new TryFrom implementation. Examples include:
- merging two queries
- omitting certain fields in a query.