Update 1.8.1 notes with latest PRs (#4393)

Update the file, remove the duplicate line, add new authors
Signed-off-by: Miek Gieben <miek@miek.nl>

notes/coredns-1.8.1.md

@@ -15,8 +15,8 @@ The CoreDNS team has released
 
 ## Brought to You By
 
-Blake Ryan, Bob, Chotiwat Chawannakul, Chris O'Haver, Guangwen Feng, Jiang Biao, Johnny Bergström,
-Matt Kulka, Miek Gieben, Serge, Yong Tang, ZouYu, mgugger
+Blake Ryan, Bob, Chotiwat Chawannakul, Chris O'Haver, Guangwen Feng, Gunadhya, Jiang Biao, Johnny
+Bergström, luanphantiki, Matt Kulka, mgugger, Miek Gieben, Serge, sschepens, Yong Tang, ZouYu.
 
 ## Noteworthy Changes
 
@@ -25,19 +25,18 @@ Matt Kulka, Miek Gieben, Serge, Yong Tang, ZouYu, mgugger
 * core: custom DoH request validation (https://github.com/coredns/coredns/pull/4329)
 * pkg/tls: remove InsecureSkipVerify=true flag (https://github.com/coredns/coredns/pull/4265)
 * plugin/azure: return FQDN as MNAME in SOA record (https://github.com/coredns/coredns/pull/4286)
-* plugin/cache: Move .LocalAddr() out of goroutine (https://github.com/coredns/coredns/pull/4281)
-* plugin/cache: Fix concurrent prefetch (TODO)
+* plugin/cache Prevent race from prefetching (https://github.com/coredns/coredns/pull/4368)
 * plugin/dnssec: Change hash key input (https://github.com/coredns/coredns/pull/4372)
 * plugin/dnstap: remove config struct (https://github.com/coredns/coredns/pull/4258)
 * plugin/dnstap: remove custom encoder (https://github.com/coredns/coredns/pull/4242)
 * plugin/file: Use NXDOMAIN response if CNAME target is NXDOMAIN (https://github.com/coredns/coredns/pull/4303)
+* plugin/file: document wrong behavior in lookup fox Apex (https://github.com/coredns/coredns/pull/4376)
 * plugin/forward: respond with REFUSED when max_concurrent is exceeded (https://github.com/coredns/coredns/pull/4326)
-* plugin/forward: perform HC every 0.5 (TODO)
+* plugin/forward: HC every 0.5 seconds, do not do exponential backoff (https://github.com/coredns/coredns/pull/4371)
 * plugin/health: Fix health check endpoint (https://github.com/coredns/coredns/pull/4231)
 * plugin/kubernetes: Add support for dual stack ClusterIP Services (https://github.com/coredns/coredns/pull/4339)
 * plugin/kubernetes: Fix dns programming duration metric (https://github.com/coredns/coredns/pull/4255)
 * plugin/kubernetes: Fix NPE issue (https://github.com/coredns/coredns/pull/4338)
 * plugin/kubernetes: Watch EndpointSlices (https://github.com/coredns/coredns/pull/4209)
 * plugin/local: add local plugin (https://github.com/coredns/coredns/pull/4262)
-* plugin/local: add local plugin (https://github.com/coredns/coredns/pull/4262)
 * plugin/trace: Fix zipkin json_v2 (https://github.com/coredns/coredns/pull/4180)