doc: update README status

README.md

@@ -15,12 +15,13 @@ The goal is to produce idiomatic, maintainable Go code as part of a one-off conv
 	- [X] Non-leaf function calls need to check + bubble errors
 [X] Array handling
 	- [X] Infer whether to use slice/map for PHP array
-[ ] Multi-file programs
-	- [ ] Include/Require
 [-] Namespaces
 	- [X] Basic support for `namespace` -> package name transformation
 	- [ ] Resolve namespace names in calls
 	- [ ] Resolve `use` statements
+[X] `if`
+[X] `for`/`foreach`
+[ ] `switch`
 [ ] Generators
 [ ] Numbered break/continue
 [ ] Goto
@@ -41,7 +42,7 @@ The goal is to produce idiomatic, maintainable Go code as part of a one-off conv
 	- Go doesn't support assignment in rvalues, only as a statement
 	- When walking below stmt level, need to first fully walk and check for any function calls + assignments that may need hoisting (and we can probably only do that correctly if there is no short-circuiting)
 	- [X] Add subtree walk + catch error for this case
-[ ] Closures
+[X] Closures
 	- [ ] Handle value/reference captures
 [X] Convert top-level calls to `init()`/`main()`
 	- [X] Wrap in function
@@ -69,6 +70,8 @@ The goal is to produce idiomatic, maintainable Go code as part of a one-off conv
 
 ### Productionize
 
+[ ] Multi-file programs
+	- [ ] Include/Require
 [ ] Infer whether to declare variable (`var` / `:=`) or reuse (`=`)
 	- [ ] Track current visibility scope
 [ ] Comprehensive coverage of all AST node types
@@ -76,6 +79,7 @@ The goal is to produce idiomatic, maintainable Go code as part of a one-off conv
 	- [ ] Node
 	- [ ] Stmt
 	- [ ] Expr
+	- [ ] Assign
 	- [X] Binary
 	- [ ] Scalar
 		- [ ] Heredocs/nowdocs
@@ -91,6 +95,10 @@ The goal is to produce idiomatic, maintainable Go code as part of a one-off conv
 [ ] Simple standard library transformations
 	- [X] common string/array functions
 	- [ ] More string/array functions
+		- Top 100 from https://www.exakat.io/top-100-php-functions/ 
+	- [ ] substr -> slice index operator (although that doesn't have the same reference semantics)
+	- [ ] error_reporting(E_ALL) --> just remove it
+	- [ ] ini_set('display_errors', 'On') --> remove it when the parameter is known
 [ ] Elide error return for functions that cannot throw
 	- ?? Could be a standalone Go refactoring tool
 
@@ -124,3 +132,8 @@ The goal is to produce idiomatic, maintainable Go code as part of a one-off conv
 	- The parser does have full positional information - exporting at the stmt level would be reasonable
 	- But the gofmt pass may lose this information
 [ ] Command-line tool option to `go run`
+
+
+## Reference
+
+- [The Go Programming Language Specification](https://golang.org/ref/spec)