Merge #659: Update EOL dates for 0.16 and 0.17

cb223fc Update EOL dates for 0.16 and 0.17 (MarcoFalke)

Pull request description:

  EOL dates for 0.16 and 0.17 have not been announced, so do that by bumping the date of the previous version by 6 months.

  Also, remove historic release dates for software version 0.8 -- 0.14, since we do not list the release dates for versions 0.7 and before.

ACKs for commit cb223f:
  jnewbery:
    ACK cb223fc

Tree-SHA512: 972bd6cc46cdaba1c318636f0282f63c9c9e2fe89d33940b60649a74f0abedddf7e300dc4c796023d29fe3c14180f21e8145b3d198de1c103a279be946f0c1aa

Author: harding

_includes/posts/maintenance-table.md

@@ -1,12 +1,5 @@
-| 0.8  | 2013-02-19 | 2014-03-19  | 2015-12-31 |
-| 0.9  | 2014-03-19 | 2015-06-16  | 2016-02-28 |
-| 0.10 | 2015-02-16 | 2016-02-29  | 2017-02-28 |
-| 0.11 | 2015-07-12 | 2016-08-23  | 2017-08-01 |
-| 0.12 | 2016-02-23 | 2017-03-31  | 2018-02-28 |
-| 0.13 | 2016-08-23 | 2017-09-15  | 2018-08-01 |
-| 0.14 | 2017-03-08 | 2018-02-26  | 2019-02-01 |
 | 0.15 | 2017-09-15 | 2018-10-03  | 2019-08-01 |
-| 0.16 | 2018-02-26 | after v0.18 | TBA        |
-| 0.17 | 2018-10-03 | after v0.19 | TBA        |
+| 0.16 | 2018-02-26 | 2019-05-02  | 2020-02-01 |
+| 0.17 | 2018-10-03 | after v0.19 | 2020-08-01 |
 | 0.18 | 2019-05-02 | after v0.20 | TBA        |
 | 0.19 | TBA*       | after v0.21 | TBA        |