fix expression aritmetic

dynamodb/expression.odin

@@ -111,7 +111,7 @@ tokenizer_next :: proc(t: ^Tokenizer) -> Maybe(string) {
 	}
 
 	// Single-character operators
-	if c == '=' || c == '<' || c == '>' {
+	if c == '=' || c == '<' || c == '>' || c == '+' || c == '-' {
 		t.pos += 1
 		return t.input[start:t.pos]
 	}
@@ -138,9 +138,9 @@ is_whitespace :: proc(c: byte) -> bool {
 @(private = "file")
 is_ident_char :: proc(c: byte) -> bool {
 	return (c >= 'a' && c <= 'z') ||
-	       (c >= 'A' && c <= 'Z') ||
-	       (c >= '0' && c <= '9') ||
-	       c == '_' || c == ':' || c == '#' || c == '-' || c == '.'
+			(c >= 'A' && c <= 'Z') ||
+			(c >= '0' && c <= '9') ||
+			c == '_' || c == ':' || c == '#' || c == '.'
 }
 
 // ---------------------------------------------------------------------------