chores: update examples and readme because of SetLanguage change

Author: giuliano-macedo

README.md

@@ -19,7 +19,7 @@ import (
 )
 
 parser := sitter.NewParser()
-parser.SetLanguage(javascript.GetLanguage())
+_ = parser.SetLanguage(javascript.GetLanguage())
 ```
 
 Parse some code:

_examples/main.go

@@ -11,7 +11,7 @@ func main() {
 	input := []byte("function hello() { console.log('hello') }; function goodbye(){}")
 
 	parser := sitter.NewParser()
-	parser.SetLanguage(javascript.GetLanguage())
+	_ = parser.SetLanguage(javascript.GetLanguage())
 
 	tree := parser.Parse(nil, input)