5.3.0 release notes: combined, organized, added contributors, boilerplate

Also removed redundant issues from 5.2.1 and 5.2.2

contributor-key.yml

@@ -85,6 +85,10 @@
   organization: Circle Interactive
   jira        : andyw
 
+- github      : aniesshsethh
+  name        : Aniessh Sethh
+  jira        : aniesshsethh
+
 - name        : Anna Kovalova
   organization: CompuCorp
   jira        : anna
@@ -97,6 +101,8 @@
   organization: Annertech
   jira        : anthonylindsay
 
+- github      : applicado
+
 - github      : arborrow
   name        : Anthony Borrow
   jira        : arborrow
@@ -498,6 +504,10 @@
   organization: CiviHosting
   jira        : hershel
 
+- name        : Paul Butler
+  organization: Hudson-Essex-Terraplane Club
+  jira        : hetclub
+
 - github      : sunnycs121
   name        : Hassan Farooq
   organization: BackOffice Thinking
@@ -568,6 +578,10 @@
   organization: AGH Strategies
   jira        : jehanley
 
+- github      : jensschuppe
+  name        : Jens Schuppe
+  jira        : jensschuppe
+
 - github      : jernic
   name        : jernic
 
@@ -718,7 +732,8 @@
   organization: Web Access
   jira        : kurund
 
-- name        : Lars Sanders-Green
+- github      : larssg-wildsight
+  name        : Lars Sanders-Green
   organization: Wildsight
   jira        : larssg
 

release-notes.md

@@ -14,6 +14,35 @@ Other resources for identifying changes are:
     * https://github.com/civicrm/civicrm-joomla
     * https://github.com/civicrm/civicrm-wordpress
 
+## CiviCRM 5.3.0
+
+Released July 3, 2018
+
+- **[Synopsis](release-notes/5.3.0.md#synopsis)**
+- **[Features](release-notes/5.3.0.md#features)**
+- **[Bugs resolved](release-notes/5.3.0.md#bugs)**
+- **[Miscellany](release-notes/5.3.0.md#misc)**
+- **[Credits](release-notes/5.3.0.md#credits)**
+- **[Feedback](release-notes/5.3.0.md#feedback)**
+
+## CiviCRM 5.2.2
+
+Released June 19, 2018
+
+- **[Synopsis](release-notes/5.2.2.md#synopsis)**
+- **[Bugs resolved](release-notes/5.2.2.md#bugs)**
+- **[Credits](release-notes/5.2.2.md#credits)**
+- **[Feedback](release-notes/5.2.2.md#feedback)**
+
+## CiviCRM 5.2.1
+
+Released June 8, 2018
+
+- **[Synopsis](release-notes/5.2.1.md#synopsis)**
+- **[Bugs resolved](release-notes/5.2.1.md#bugs)**
+- **[Credits](release-notes/5.2.1.md#credits)**
+- **[Feedback](release-notes/5.2.1.md#feedback)**
+
 ## CiviCRM 5.2.0
 
 Released June 6, 2018