add methods isspace(), isalpha(), isdigit(), isupper() and islower() to str
diff --git a/py/misc.h b/py/misc.h
index 013b5f1..fd54147 100644
--- a/py/misc.h
+++ b/py/misc.h
@@ -96,6 +96,8 @@
 bool unichar_isprint(unichar c);
 bool unichar_isdigit(unichar c);
 bool unichar_isxdigit(unichar c);
+bool unichar_isupper(unichar c);
+bool unichar_islower(unichar c);
 unichar unichar_tolower(unichar c);
 unichar unichar_toupper(unichar c);