EXHIBIT 99.1
JOINT FILING AGREEMENT
Each of the undersigned hereby agrees that this Amendment No. 1 to the statement on Schedule 13D is being filed with the Securities and Exchange Commission on behalf of each of the undersigned pursuant to Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended.
Date: December 15, 2017
| ESTERA TRUST (JERSEY) LIMITED in its capacity as trustee of THE RYFOLD TRUST | |||
| By: | /s/ Melanie McEnery | ||
| Name: | Melanie McEnery | ||
| Title: | Director | ||
| ESTERA TRUST (JERSEY) LIMITED | |||
| By: | /s/ Melanie McEnery | ||
| Name: | Melanie McEnery | ||
| Title: | Director | ||
| RYFOLD LIMITED | |||
| By: | /s/ Melanie McEnery | ||
| Name: | Melanie McEnery | ||
| Title: | Director | ||
| GIVOLON LIMITED | |||
| By: | /s/ Melanie McEnery | ||
| Name: | Melanie McEnery | ||
| Title: | Director | ||
