Post release cleanup (#138)

* Update release publishing script

* Set version to 0.21.0-SNAPSHOT

Author: sstone

build.gradle.kts

@@ -12,7 +12,7 @@ plugins {
 val currentOs = org.gradle.internal.os.OperatingSystem.current()
 
 group = "fr.acinq.bitcoin"
-version = "0.20.0"
+version = "0.21.0-SNAPSHOT"
 
 repositories {
     google()

publishing/bitcoin-kmp-staging-upload.sh

@@ -21,7 +21,9 @@ for i in 	bitcoin-kmp \
 		bitcoin-kmp-iossimulatorarm64 \
 		bitcoin-kmp-iosx64 \
 		bitcoin-kmp-jvm \
-		bitcoin-kmp-linuxx64
+		bitcoin-kmp-linuxx64 \
+		bitcoin-kmp-macosarm64 \
+		bitcoin-kmp-macosx64
 do
 	pushd .
 	cd release/fr/acinq/bitcoin/$i/$VERSION &&\