Many warnings in logs when installing the library

[mgomez08]

Reporting an issue

Thank you for taking an interest in rrule! Please include the following in your report:

• [x] Verify that you've looked through existing issues for duplicates before creating a new one
• [x] Code sample reproducing the issue. Be sure to include all input values you are using such as the exact RRule string and dates.
• [x] Expected output: Logs without warning, build successful
• [x] Actual output:
• [x] The version of rrule you are using: 2.7.1
• [x] Your operating system: Windows
• [x] Your local timezone (run $ date from the command line of the machine showing the bug): GMT-5