Prepare the 1.9.0rc0 release. (#6171)

* add 1.9.x.rst copied from previous release notes

* add dates and SHAs

* bump VERSION file

* learn how to use release-changelog-helper.sh

* revert VERSION file changes

* copy 1.9.0rc0 notes over into master.rst

* Revert "revert VERSION file changes"

This reverts commit d031577.

* run ./build-support/bin/contributors.sh

* convert ---- subheading to ~~~~~~

* bump release candidate date

* update changelog after rebase

* add bugfix commit

CONTRIBUTORS.md

@@ -169,6 +169,7 @@ Created by running `./build-support/bin/contributors.sh`.
 + Troy Howard
 + Ugo Di Girolamo
 + Wei An
++ Wilhelmina Drengwitz
 + Wolfram Arnold
 + Xaelias
 + Yi Cheng

pants.ini

@@ -334,6 +334,7 @@ branch_notes: {
     '1.6.x': 'src/python/pants/notes/1.6.x.rst',
     '1.7.x': 'src/python/pants/notes/1.7.x.rst',
     '1.8.x': 'src/python/pants/notes/1.8.x.rst',
+    '1.9.x': 'src/python/pants/notes/1.9.x.rst',
   }
 
 

src/docs/docsite.json

@@ -58,6 +58,7 @@
     "notes-1.6.x": "dist/markdown/html/src/python/pants/notes/1.6.x.html",
     "notes-1.7.x": "dist/markdown/html/src/python/pants/notes/1.7.x.html",
     "notes-1.8.x": "dist/markdown/html/src/python/pants/notes/1.8.x.html",
+    "notes-1.9.x": "dist/markdown/html/src/python/pants/notes/1.9.x.html",
     "notes-master": "dist/markdown/html/src/python/pants/notes/master.html",
     "notes-master": "dist/markdown/html/src/python/pants/notes/master.html",
     "options": "dist/markdown/html/src/docs/options.html",
@@ -120,12 +121,12 @@
 
        {"heading": "Getting Started"},
        {"pages": [
-                     "install", 
+                     "install",
                      "setup_repo",
                      "first_tutorial",
                      "common_tasks"
                 ]
-            
+
        },
        {"heading": "Pants Basics"},
        {"pages" : [
@@ -176,6 +177,7 @@
        },
        {"collapsible_heading": "Release Notes",
         "pages" : [
+                    "notes-1.9.x",
                     "notes-1.8.x",
                     "notes-1.7.x",
                     "notes-1.6.x",

src/python/pants/VERSION

@@ -1 +1 @@
-1.9.0.dev1
+1.9.0rc0