Add driver version 2.9 to compatibility tables

Author: p

docs/reference/driver-compatibility.txt

@@ -27,6 +27,15 @@ MongoDB Compatibility
      - MongoDB 2.6
      - MongoDB 2.4
 
+   * - 2.9
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+     -
+
    * - 2.8
      - |checkmark|
      - |checkmark|
@@ -172,6 +181,20 @@ Ruby Compatibility
      - JRuby 9.1
      - JRuby
 
+   * - 2.9
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+     -
+     - |checkmark|
+     - |checkmark|
+     -
+
    * - 2.8
      - |checkmark|
      - |checkmark|