Add Dynamic::is_XXX API.

CHANGELOG.md

@@ -25,6 +25,11 @@ Breaking changes
 New features
 ------------
 
+### `Dynamic` detection API
+
+* New methods are added to `Dynamic` in the form of `is_XXX()` where `XXX` is a type (e.g. `is_int`, `is_unit`, `is_bool`, `is_array`).
+* This new API is to make it easier to detect the data type, instead of having to call `is::<XXX>()`.
+
 ### Loop expressions
 
 * Loops (such as `loop`, `do`, `while` and `for`) can now act as _expressions_, with the `break` statement returning an optional value.
@@ -37,9 +42,9 @@ New features
 * This is necessary when using Rhai across shared-library boundaries.
 * A build script is used to extract the environment variable (`RHAI_AHASH_SEED`, if any) and splice it into the source code before compilation.
 
-### No Timestamps
+### `no_time` for no timestamps
 
-* A new feature, `no_time`, is added to disable support timestamps.
+* A new feature, `no_time`, is added to disable support for timestamps.
 * This may be necessary when building for architectures without time support, such as raw WASM.
 
 ### Serializable `Scope`