Add squashed release notes for Dogecoin 1.14.8

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+Dogecoin Core version 1.14.8 is now available from:
+
+  <https://github.com/dogecoin/dogecoin/releases/tag/v1.14.8/>
+
+This is a new minor version release. Dogecoin users on any platform are
+strongly recommended to upgrade.
+
+Please report bugs using the issue tracker at GitHub:
+
+  <https://github.com/dogecoin/dogecoin/issues>
+
+To receive notifications about updates, subscribe to the release mailing list:
+
+  <https://sourceforge.net/projects/dogecoin/lists/dogecoin-releases>
+
+
+Compatibility
+==============
+
+Dogecoin Core is extensively tested on Ubuntu Server LTS, macOS and Windows.
+Minimum OS compatibility can be found [in the INSTALL guide](../INSTALL.md).
+
+
+Notable changes
+================
+
+Important Updates
+-----------------
+
+Several important updates have been added to Dogecoin Core, including fixes
+backported from Bitcoin Core's upstream.
+
+### Reduce Peer INV Object Counts
+
+Previously, Dogecoin Core nodes would maintain a large list of inventory for
+each peer. This is excessive and unnecessary and has been reduced to a more
+reasonable number.
+
+*Implemented with #3577*
+
+### Improve Transaction Request Tracking
+
+A new transaction request tracking system improves the way Dogecoin Core
+communicates with other peers. Notably, this improvement prioritizes
+communication with outbound peers over inbound peers and makes CPU and memory
+use more reliable and scalable with the number of peers.
+
+*Implemented with #3577*
+
+### Improve Orphan Transaction Handling
+
+In previous versions of Dogecoin Core, orphan transactions were processed in a
+complex fashion. Now they are processed more like regular getdata messages,
+which allows for more efficient handling of messages arriving from other peers,
+as well as other code simplifications.
+
+*Implemented with #3575*
+
+### Reduce Getheaders Traffic for INV Messages
+
+Dogecoin Core now sends a getheaders message for one block when announced in an
+INV message, and it sends only a single such message rather than multiple per
+INV message. This reduces traffic and simplifies the logic of the code.
+
+*Implemented with #3568*
+
+### Improve Reporting of Difficulty Adjustment Errors
+
+Previously, difficulty adjustment violations were not reported for chains that
+branched off before the last checkpoint. This has been changed by moving the
+checkpoint check after the difficulty check.
+
+*Implemented with #3576*
+
+### Security Policy Documented
+
+The [SECURITY.md](SECURITY.md) file describes how to report a potential
+vulnerability or security issue in Dogecoin Core.
+
+*Implemented with #3611*
+
+
+Dependency Updates
+------------------
+
+* Updated fontconfig to version 2.12.6 (#3590)
+* Updated freetype to version 2.11.0 (#3590)
+* Updated expat to version 2.6.2 (#3590)
+* Allow compiling with Boost 1.80 and newer (#3588)
+
+
+Minor Changes
+=============
+
+* Dogecoin Core now supports compilation with C++14 and C++17, if you select
+  the appropriate configuration flags (#3494, ... )
+* With the C++ version updates, the code now uses more built-in C++ features instead
+  of Boost equivalents, where possible (various commits)
+* The CI configuration was updated to be compatible with newer versions of Python (#3582)
+* Rely on the well-tested OpenSSL secure random functions, but allow the use of std::shuffle (#3521)
+
+
+Credits
+=======
+
+Credit goes to all awesome contributors to this release, alphabetically:
+
+* Amiti Uttarwar
+* Anthony Chen
+* chromatic
+* daanksy
+* Dakoda Greaves
+* Ed Tubbs
+* Hennadii Stepanov
+* John Newbery
+* Michi Lumin
+* Patrick Lodder
+* Pieter Wuille
+* practicalswift
+* Russell Yanofsky
+* Twinky-kms
+* Wladimir J. van der Laan