fix #1365

Author: AllenFang

src/BootstrapTable.js

@@ -1437,10 +1437,10 @@ BootstrapTable.propTypes = {
     noDataText: PropTypes.oneOfType([ PropTypes.string, PropTypes.object ]),
     withoutNoDataText: React.PropTypes.bool,
     handleConfirmDeleteRow: PropTypes.func,
-    prePage: PropTypes.string,
-    nextPage: PropTypes.string,
-    firstPage: PropTypes.string,
-    lastPage: PropTypes.string,
+    prePage: PropTypes.any,
+    nextPage: PropTypes.any,
+    firstPage: PropTypes.any,
+    lastPage: PropTypes.any,
     prePageTitle: PropTypes.string,
     nextPageTitle: PropTypes.string,
     firstPageTitle: PropTypes.string,