Linkerd 1.4.2 (#1984)

Linkerd 1.4.2 continues its focus on diagnostics and stability. This release introduces Diagnostic 
Tracing, a feature that helps describe how Linkerd routes requests by displaying detailed routing information from each hop through your application. Stay tuned for a deep dive blog post about this feature coming soon. 

We’re also excited to share improvements to Linkerd’s error handling. Previously, when Linkerd failed to route a request, it could fail with a notoriously confusing `No Hosts Available` error. 
Now, these errors include more useful, informative diagnostic information to help explain the cause 
of the failure.

Full release notes:

* Diagnostics
   * Improve error reporting when receiving `No Hosts Available` exception.  Linkerd returns a less cryptic user-friendly message that includes information such as alternative service name resolutions and dtabs used for name resolution.
   * Add a new diagnostic tracing feature. It allows Linkerd to add routing information to the response of a `TRACE` request forwarded to a service.
* Fixes an issue where underscores in match patterns of `io.l5d.rewrite` no longer work.

Signed-off-by: Dennis Adjei-Baah <dennis@buoyant.io>

CHANGES.md

@@ -1,3 +1,22 @@
+## 1.4.2 2018-06-11
+
+Linkerd 1.4.2 continues its focus on diagnostics and stability. This release introduces Diagnostic 
+Tracing, a feature that helps describe how Linkerd routes requests by displaying detailed routing 
+information from each hop through your application. Stay tuned for a deep dive blog post about this 
+feature coming soon. 
+
+We’re also excited to share improvements to Linkerd’s error handling. Previously, when Linkerd 
+failed to route a request, it could fail with a notoriously confusing `No Hosts Available` error. 
+Now, these errors include more useful, informative diagnostic information to help explain the cause 
+of the failure.
+
+Full release notes:
+
+* Diagnostics
+   * Improve error reporting when receiving `No Hosts Available` exception.  Linkerd returns a less cryptic user-friendly message that includes information such as alternative service name resolutions and dtabs used for name resolution.
+   * Add a new diagnostic tracing feature. It allows Linkerd to add routing information to the response of a `TRACE` request forwarded to a service.
+* Fixes an issue where underscores in match patterns of `io.l5d.rewrite` no longer work.
+
 ## 1.4.1 2018-05-25
 
 Linkerd 1.4.1 is focused on adding diagnostics and improved behavior in

project/Base.scala

@@ -32,7 +32,7 @@ object Base {
 class Base extends Build {
   import Base._
 
-  val headVersion = "1.4.1"
+  val headVersion = "1.4.2"
   val openJdkVersion = "8u151"
 
   object Git {