Update prop-types definition of theme

Author: chalkpe

src/DaumPostcode.jsx

@@ -137,7 +137,17 @@ DaumPostcode.propTypes = {
   showMoreHName: PropTypes.bool,
   style: PropTypes.object,
   submitMode: PropTypes.bool,
-  theme: PropTypes.object,
+  theme: PropTypes.exact({
+    bgColor: PropTypes.string,
+    searchBgColor: PropTypes.string,
+    contentBgColor: PropTypes.string,
+    pageBgColor: PropTypes.string,
+    textColor: PropTypes.string,
+    queryTextColor: PropTypes.string,
+    postcodeTextColor: PropTypes.string,
+    emphTextColor: PropTypes.string,
+    outlineColor: PropTypes.string,
+  }),
   useSuggest: PropTypes.bool,
   width: PropTypes.oneOfType([PropTypes.number, PropTypes.string]),
   focusInput: PropTypes.bool,