Bump version to 1.5.2 (#2969)

Run through the motions; create manual pages. Run go generate for good
measure. Fix typo in Makefile.release while at it.

Signed-off-by: Miek Gieben <miek@miek.nl>

man/coredns-federation.7

@@ -1,5 +1,5 @@
 .\" Generated by Mmark Markdown Processer - mmark.nl
-.TH "COREDNS-FEDERATION" 7 "April 2019" "CoreDNS" "CoreDNS Plugins"
+.TH "COREDNS-FEDERATION" 7 "July 2019" "CoreDNS" "CoreDNS Plugins"
 
 .SH "NAME"
 .PP
@@ -22,7 +22,6 @@ Enabling \fIfederation\fP without also having \fIkubernetes\fP is a noop.
 .nf
 federation [ZONES...] {
     NAME DOMAIN
-    upstream
 }
 
 .fi
@@ -31,10 +30,6 @@ federation [ZONES...] {
 .IP \(bu 4
 Each \fBNAME\fP and \fBDOMAIN\fP defines federation membership. One entry for each. A duplicate
 \fBNAME\fP will silently overwrite any previous value.
-.IP \(bu 4
-\fB\fCupstream\fR resolve the \fB\fCCNAME\fR target produced by this plugin.  CoreDNS
-will resolve External Services against itself and needs the \fIforward\fP plugin to be active to do
-so.
 
 
 .SH "EXAMPLES"
@@ -50,7 +45,6 @@ Here we handle all service requests in the \fB\fCprod\fR and \fB\fCstage\fR fede
     federation cluster.local {
         prod prod.feddomain.com
         staging staging.feddomain.com
-        upstream
     }
     forward . 192.168.1.12
 }