forward-port changelog and releasenotes from 0.4.0.5

ChangeLog

+Changes in version 0.4.0.5 - 2019-05-02
+  This is the first stable release in the 0.4.0.x series. It contains
+  improvements for power management and bootstrap reporting, as well as
+  preliminary backend support for circuit padding to prevent some kinds
+  of traffic analysis. It also continues our work in refactoring Tor for
+  long-term maintainability.
+
+  Per our support policy, we will support the 0.4.0.x series for nine
+  months, or until three months after the release of a stable 0.4.1.x:
+  whichever is longer. If you need longer-term support, please stick
+  with 0.3.5.x, which will we plan to support until Feb 2022.
+
+  Below are the changes since 0.4.0.4-rc. For a complete list of changes
+  since 0.3.5.7, see the ReleaseNotes file.
+
+  o Minor features (continuous integration):
+    - In Travis, tell timelimit to use stem's backtrace signals, and
+      launch python directly from timelimit, so python receives the
+      signals from timelimit, rather than make. Closes ticket 30117.
+
+  o Minor features (diagnostic):
+    - Add more diagnostic log messages in an attempt to solve the issue
+      of NUL bytes appearing in a microdescriptor cache. Related to
+      ticket 28223.
+
+  o Minor features (testing):
+    - Use the approx_time() function when setting the "Expires" header
+      in directory replies, to make them more testable. Needed for
+      ticket 30001.
+
+  o Minor bugfixes (rust):
+    - Abort on panic in all build profiles, instead of potentially
+      unwinding into C code. Fixes bug 27199; bugfix on 0.3.3.1-alpha.
+
+  o Minor bugfixes (shellcheck):
+    - Look for scripts in their correct locations during "make
+      shellcheck". Previously we had looked in the wrong place during
+      out-of-tree builds. Fixes bug 30263; bugfix on 0.4.0.1-alpha.
+
+  o Minor bugfixes (testing):
+    - Check the time in the "Expires" header using approx_time(). Fixes
+      bug 30001; bugfix on 0.4.0.4-rc.
+
+  o Minor bugfixes (UI):
+    - Lower log level of unlink() errors during bootstrap. Fixes bug
+      29930; bugfix on 0.4.0.1-alpha.
+
+
 Changes in version 0.4.0.4-rc - 2019-04-11
   Tor 0.4.0.4-rc is the first release candidate in its series; it fixes
   several bugs from earlier versions, including some that had affected