Add missing changes files for #26360, #28179, #28180.

See: https://bugs.torproject.org/26179
See: https://bugs.torproject.org/28180
See: https://bugs.torproject.org/28360

changes/ticket26360

@@ -0,0 +1,4 @@
+  o Minor bugfixes (pluggable transports):
+    - Make sure that data is continously read from standard out and error of the
+      PT child-process to avoid deadlocking when the pipes' buffer is full.
+      Fixes bug 26360; bugfix on 0.2.3.6-alpha.

changes/ticket28179

@@ -0,0 +1,5 @@
+  o Minor features (process):
+    - Add new Process API for handling child processes. This
+      new API allows Tor to have bi-directional
+      communication with child processes on both Unix and Windows.
+      Closes ticket 28179.

changes/ticket28180

@@ -0,0 +1,3 @@
+  o Minor features (pluggable transports):
+    - Add support for logging to Tor's logging subsystem from a pluggable
+      transport process. Partial implementation for ticket 28180