update Plugin compatibility matrix

Author: TheSnoozer

README.md

@@ -67,17 +67,29 @@ Plugin compatibility with Maven
 -----------------------------
 Even though this plugin tries to be compatible with every Maven version there are some known limitations with specific versions. Here is a list that tries to outline the current state of the art:
 
-| Maven Version               | Plugin Version  | Notes                                                                                                           |
-| --------------------------- | ---------------:|:---------------------------------------------------------------------------------------------------------------:|
-| Maven 3.0.X (EOL)           | up to 4.0.5     | Maven 3.0.X is EOL
-| Maven 3.1.0                 | any             | git-commit-id-plugin:2.1.14, 2.1.15, 2.2.0, 2.2.1, 2.2.3 doesn't work -- requires maven version 3.1.1           |
-| Maven 3.3.1                 | any             | git-commit-id-plugin:2.1.14 doesn't work                                                                        |
-| Maven 3.3.3                 | any             | git-commit-id-plugin:2.1.14 doesn't work                                                                        |
-| Maven 3.X.X (3.0.X is EOL)  | any             | Any other non listed version here should work with any plugin version                                           |
-
+| Plugin Version |               Minimal Required Maven version               |
+|----------------|:----------------------------------------------------------:|
+| 2.1.X          | Maven 2.2.1 up to v2.1.13; Maven 3.1.1 for any later 2.1.X |
+| 2.2.X          |  Maven 3.1.1 up to v2.2.3; Maven 3.0 for any later 2.2.X   |
+| 3.0.0          |                         Maven 3.0                          |
+| 4.0.0          |                         Maven 3.0                          |
+| 5.0.0          |                    Maven 3.1.0-alpha-1                     |
+| 6.0.0          |                    Maven 3.1.0-alpha-1                     |
+| 7.0.0          |                        Maven 3.2.5                         |
+
+Flipping the table to maven:
+Please note that in theory maven 4.X should support all maven 3 plugins.
+The plugin was first shipped with maven 3 support in version v2.1.14 (requiring maven version 3.1.1).
+Hence the v2.1.14 should be the first supported version.
+Only starting with 6.X.X this plugin was acually tested with 4.0.0-alpha-5,
+but some releases might not work since Maven 4 announced that plugins require Maven 3.2.5 or later
+which would only be the case for plugin versions 7.0.0 or later. 
+
+| Maven Version |  Plugin Version |                       Notes                        |
+|---------------|----------------:|:--------------------------------------------------:|
+| Maven 3.X     |             any | The plugin requires at least a maven 3.1.0-alpha-1 |
+| Maven 4.X     |    from v2.1.14 |                                                    |
 
-Note:
-As an example -- this table should be read as: For `Maven 3.1.0` `any` Plugin Version should work, besides the ones listed in the `Notes` have the limitations listed.
 
 Plugin compatibility with EOL Maven version
 -----------------------------
@@ -90,6 +102,12 @@ The following information is made available for reference.
 | Maven 2.2.1                 | up to 2.2.6     | Maven 2 is EOL                                                                                                  |
 | Maven 3.0.X                 | up to 4.0.5     | git-commit-id-plugin:2.1.14, 2.1.15, 2.2.0, 2.2.1, 2.2.3  doesn't work  -- requires maven version 3.1.1         |
 | Maven 3.0.X                 | up to 4.0.5     | For git-commit-id-plugin 2.2.4 or higher: works, but failed to load class "org.slf4j.impl.StaticLoggerBinder"   |
+| Maven 3.1.0                 | any             | git-commit-id-plugin:2.1.14, 2.1.15, 2.2.0, 2.2.1, 2.2.3 doesn't work -- requires maven version 3.1.1           |
+| Maven 3.3.1                 | any             | git-commit-id-plugin:2.1.14 doesn't work                                                                        |
+| Maven 3.3.3                 | any             | git-commit-id-plugin:2.1.14 doesn't work                                                                        |
+
+Note:
+As an example -- this table should be read as: For `Maven 3.1.0` `any` Plugin Version should work, besides the ones listed in the `Notes` have the limitations listed.
 
 
 Getting SNAPSHOT versions of the plugin