Copy 0.4.1.6 block into changelog/releasenotes in master

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+Changes in version 0.4.1.6 - 2019-09-19
+  This release backports several bugfixes to improve stability and
+  correctness.  Anyone experiencing build problems or crashes with 0.4.1.5,
+  or experiencing reliability issues with single onion services, should
+  upgrade.
+
+  o Major bugfixes (crash, Linux, Android, backport from 0.4.2.1-alpha):
+    - Tolerate systems (including some Android installations) where
+      madvise and MADV_DONTDUMP are available at build-time, but not at
+      run time. Previously, these systems would notice a failed syscall
+      and abort. Fixes bug 31570; bugfix on 0.4.1.1-alpha.
+    - Tolerate systems (including some Linux installations) where
+      madvise and/or MADV_DONTFORK are available at build-time, but not
+      at run time. Previously, these systems would notice a failed
+      syscall and abort. Fixes bug 31696; bugfix on 0.4.1.1-alpha.
+
+  o Minor features (stem tests, backport from 0.4.2.1-alpha):
+    - Change "make test-stem" so it only runs the stem tests that use
+      tor. This change makes test-stem faster and more reliable. Closes
+      ticket 31554.
+
+  o Minor bugfixes (build system, backport form 0.4.2.1-alpha):
+    - Do not include the deprecated <sys/sysctl.h> on Linux or Windows
+      systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
+
+  o Minor bugfixes (compilation, backport from 0.4.2.1-alpha):
+    - Add more stub functions to fix compilation on Android with link-
+      time optimization when --disable-module-dirauth is used.
+      Previously, these compilation settings would make the compiler
+      look for functions that didn't exist. Fixes bug 31552; bugfix
+      on 0.4.1.1-alpha.
+    - Suppress spurious float-conversion warnings from GCC when calling
+      floating-point classifier functions on FreeBSD. Fixes part of bug
+      31687; bugfix on 0.3.1.5-alpha.
+
+  o Minor bugfixes (controller protocol):
+    - Fix the MAPADDRESS controller command to accept one or more
+      arguments. Previously, it required two or more arguments, and ignored
+      the first. Fixes bug 31772; bugfix on 0.4.1.1-alpha.
+
+  o Minor bugfixes (guards, backport from 0.4.2.1-alpha):
+    - When tor is missing descriptors for some primary entry guards,
+      make the log message less alarming. It's normal for descriptors to
+      expire, as long as tor fetches new ones soon after. Fixes bug
+      31657; bugfix on 0.3.3.1-alpha.
+
+  o Minor bugfixes (logging, backport from 0.4.2.1-alpha):
+    - Change log level of message "Hash of session info was not as
+      expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
+      on 0.1.1.10-alpha.
+
+  o Minor bugfixes (rust, backport from 0.4.2.1-alpha):
+    - Correctly exclude a redundant rust build job in Travis. Fixes bug
+      31463; bugfix on 0.3.5.4-alpha.
+
+  o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha):
+    - Always retry v2 single onion service intro and rend circuits with
+      a 3-hop path. Previously, v2 single onion services used a 3-hop
+      path when rendezvous circuits were retried after a remote or
+      delayed failure, but a 1-hop path for immediate retries. Fixes bug
+      23818; bugfix on 0.2.9.3-alpha.
+
+  o Minor bugfixes (v3 single onion services, backport from 0.4.2.1-alpha):
+    - Always retry v3 single onion service intro and rend circuits with
+      a 3-hop path. Previously, v3 single onion services used a 3-hop
+      path when rend circuits were retried after a remote or delayed
+      failure, but a 1-hop path for immediate retries. Fixes bug 23818;
+      bugfix on 0.3.2.1-alpha.
+    - Make v3 single onion services fall back to a 3-hop intro, when all
+      intro points are unreachable via a 1-hop path. Previously, v3
+      single onion services failed when all intro nodes were unreachable
+      via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
+
+  o Documentation (backport from 0.4.2.1-alpha):
+    - Use RFC 2397 data URL scheme to embed an image into tor-exit-
+      notice.html so that operators no longer have to host it
+      themselves. Closes ticket 31089.
+
+
 Changes in version 0.4.2.1-alpha - 2019-09-17
   This is the first alpha release in the 0.4.2.x series. It adds new
   defenses for denial-of-service attacks against onion services. It also