[debian] Add releaseDate for major releases (fixes #49)

Unfortunately major releases cannot be parse like point releases.

releases/debian.json

@@ -1,4 +1,5 @@
 {
+  "10": "2019-07-06",
   "10.1": "2019-09-07",
   "10.10": "2021-06-19",
   "10.11": "2021-10-09",
@@ -12,6 +13,7 @@
   "10.7": "2020-12-05",
   "10.8": "2021-02-06",
   "10.9": "2021-03-27",
+  "11": "2021-08-14",
   "11.1": "2021-10-09",
   "11.2": "2021-12-18",
   "11.3": "2022-03-26",
@@ -54,6 +56,7 @@
   "5.0.7": "2010-11-27",
   "5.0.8": "2011-01-22",
   "5.0.9": "2011-10-01",
+  "6.0": "2011-02-06",
   "6.0.1": "2011-03-19",
   "6.0.10": "2014-07-19",
   "6.0.2": "2011-06-25",
@@ -64,6 +67,7 @@
   "6.0.7": "2013-02-23",
   "6.0.8": "2013-10-20",
   "6.0.9": "2014-02-15",
+  "7.0": "2013-05-04",
   "7.1": "2013-06-15",
   "7.10": "2016-04-02",
   "7.11": "2016-06-04",
@@ -75,6 +79,7 @@
   "7.7": "2014-10-18",
   "7.8": "2015-01-10",
   "7.9": "2015-09-05",
+  "8": "2015-04-25",
   "8.1": "2015-06-06",
   "8.10": "2017-12-09",
   "8.11": "2018-06-23",
@@ -86,6 +91,7 @@
   "8.7": "2017-01-14",
   "8.8": "2017-05-06",
   "8.9": "2017-07-22",
+  "9": "2017-06-17",
   "9.1": "2017-07-22",
   "9.10": "2019-09-07",
   "9.11": "2019-09-08",