Fix Debian distro version

Author: UnderGreen

README.md

@@ -18,7 +18,7 @@ MongoDB support matrix:
 | Ubuntu 18.04   |  :no_entry:   |        :x:         | :white_check_mark: | :white_check_mark: |
 | Debian 8.x     |  :no_entry:   | :white_check_mark: | :white_check_mark: |        :x:         |
 | Debian 9.x     |  :no_entry:   | :white_check_mark: | :white_check_mark: | :white_check_mark: |
-| Debian 9.x     |  :no_entry:   |        :x:         |        :x:         | :white_check_mark: |
+| Debian 10.x    |  :no_entry:   |        :x:         |        :x:         | :white_check_mark: |
 | RHEL 6.x       |  :no_entry:   | :white_check_mark: | :white_check_mark: | :white_check_mark: |
 | RHEL 7.x       |  :no_entry:   | :white_check_mark: | :white_check_mark: | :white_check_mark: |
 | Amazon Linux 2 |  :no_entry:   |        :x:         | :white_check_mark: | :white_check_mark: |