Bump version to 0.20.0

Summary: See title (and release-process.md).

Test Plan:
```
make check
ninja

# for both builds:
bitcoind --version
bitcoin-cli --version
bitcoin-tx -h
bitcoin-qt --version
```

Reviewers: #bitcoin_abc, deadalnix, Mengerian

Reviewed By: #bitcoin_abc, Mengerian

Subscribers: Mengerian

Differential Revision: https://reviews.bitcoinabc.org/D3838

configure.ac

@@ -1,8 +1,8 @@
 dnl require autoconf 2.60 (AS_ECHO/AS_ECHO_N)
 AC_PREREQ([2.60])
 define(_CLIENT_VERSION_MAJOR, 0)
-define(_CLIENT_VERSION_MINOR, 19)
-define(_CLIENT_VERSION_REVISION, 12)
+define(_CLIENT_VERSION_MINOR, 20)
+define(_CLIENT_VERSION_REVISION, 0)
 define(_CLIENT_VERSION_BUILD, 0)
 define(_CLIENT_VERSION_IS_RELEASE, true)
 define(_COPYRIGHT_YEAR, 2019)

contrib/gitian-descriptors/gitian-linux.yml

@@ -1,5 +1,5 @@
 ---
-name: "bitcoin-abc-0.19-linux"
+name: "bitcoin-abc-0.20-linux"
 enable_cache: true
 distro: "debian"
 suites:

contrib/gitian-descriptors/gitian-osx.yml

@@ -1,5 +1,5 @@
 ---
-name: "bitcoin-abc-0.19-osx"
+name: "bitcoin-abc-0.20-osx"
 enable_cache: true
 distro: "debian"
 suites:

contrib/gitian-descriptors/gitian-win.yml

@@ -1,5 +1,5 @@
 ---
-name: "bitcoin-abc-0.19-win"
+name: "bitcoin-abc-0.20-win"
 enable_cache: true
 distro: "debian"
 suites:

doc/release-notes.md

@@ -1,9 +1,5 @@
-Bitcoin ABC version 0.19.12 is now available from:
+Bitcoin ABC version 0.20.0 is now available from:
 
-  <https://download.bitcoinabc.org/0.19.12/>
+  <https://download.bitcoinabc.org/0.20.0/>
 
 This release includes the following features and fixes:
-  - Add the `getblockstats` RPC to get statistics on a block or a block range.
-  - Logging improvements to reduce noisy network messages.
-  - Logging added during wallet rescans.
-  - Minor bug fixes, stability improvements, and typo corrections.

doc/release-notes/release-notes-0.19.12.md

@@ -0,0 +1,9 @@
+Bitcoin ABC version 0.19.12 is now available from:
+
+  <https://download.bitcoinabc.org/0.19.12/>
+
+This release includes the following features and fixes:
+  - Add the `getblockstats` RPC to get statistics on a block or a block range.
+  - Logging improvements to reduce noisy network messages.
+  - Logging added during wallet rescans.
+  - Minor bug fixes, stability improvements, and typo corrections.

src/config/CMakeLists.txt

@@ -12,8 +12,8 @@ set(PACKAGE_NAME "Bitcoin ABC" CACHE STRING "Package name")
 
 # Version
 set(CLIENT_VERSION_MAJOR 0 CACHE STRING "Major version number")
-set(CLIENT_VERSION_MINOR 19 CACHE STRING "Minor version number")
-set(CLIENT_VERSION_REVISION 12 CACHE STRING "Revision version number")
+set(CLIENT_VERSION_MINOR 20 CACHE STRING "Minor version number")
+set(CLIENT_VERSION_REVISION 0 CACHE STRING "Revision version number")
 set(CLIENT_VERSION_BUILD 0 CACHE STRING "Build version number")
 
 option(CLIENT_VERSION_IS_RELEASE "Build a release version" OFF)

src/qt/intro.cpp

@@ -23,7 +23,7 @@ static const uint64_t GB_BYTES = 1000000000LL;
 /**
  * Minimum free space (in GB) needed for data directory.
  */
-static const uint64_t BLOCK_CHAIN_SIZE = 200;
+static const uint64_t BLOCK_CHAIN_SIZE = 220;
 /**
  * Minimum free space (in GB) needed for data directory when pruned; Does not
  * include prune target.