Prepare release 3.8.0-rc0 (#429)

## Product change and motivation

Bump version & prepare release notes

## Implementation

Author: dmitrii-ubskii

RELEASE_NOTES_LATEST.md

@@ -3,28 +3,47 @@
 
 Available through https://crates.io/crates/typeql.
 ```
-cargo add typeql@3.7.0
+cargo add typeql@3.8.0-rc0
 ```
 
 
 ## New Features
-- **Try blocks in write stages**
+- **Add built-in functions iid() and label()**
 
-  We allow `try {}` blocks in all write stages, viz. `insert`, `delete`, `put`, and `update`.
+  We add `iid()` and `label()` to the built-in functions in the TypeQL grammar.
 
 
 
 ## Bugs Fixed
-
+- **Use XID_START and XID_CONTINUE character classes**
+  
+  We use `XID_START` and `XID_CONTINUE` character classes provided by pest instead of manually listing unicode codepoint ranges for our identifiers. We also change the definition of the word boundary (`WB`) to be "any character that is not an identifier continuation character" that resolves parsing bugs such as `let $var= 4;` failing to parse: `=` is not `PUNCTUATION`, so not valid word boundary.
+  
+  
 
 ## Code Refactors
 
 
-## Other Improvements 
-   
-- **Change CODEOWNERS**
+## Other Improvements
+- **Expose value parser**
+  
+  We expose value parsing as a top-level function, and update the value literal definitions. This lets us re-use the value parser for test frameworks in other repositories.
+  
+  
+- **Update TypeQL banner image link in README**
 
-- **Fix illegal grammar error formatting**
+- **Add contributing guidelines to CONTRIBUTING.md**
+
+- **Allow trailing commas (#421)**
+  
+  To simplify writing and generating queries, we allow trailing commas anywhere we use a comma separated list of variables, statements, reductions, etc.
+  
 
-  We fix the (internal) illegal grammar error formatting to show the part of the query that caused the error rather than the corresponding parsed subtree.
+- **Remove discussion and Stack Overflow links**
+
+- **Allow trailing commas**
+  
+  To simplify writing and generating queries, we allow trailing commas anywhere we use a comma separated list of variables, statements, reductions, etc.
 
+    
+

VERSION

@@ -1 +1 @@
-3.7.0
+3.8.0-rc0