add badges to README.md and sha256sum to release

Signed-off-by: Damien Degois <damien@degois.info>

Author: babs

README.md

@@ -1,5 +1,8 @@
 # multiping
 
+[![GitHub](https://img.shields.io/github/license/babs/multiping)](https://github.com/babs/multiping/blob/master/LICENSE)
+[![GitHub release (latest by date)](https://img.shields.io/github/v/release/babs/multiping)](https://github.com/babs/multiping/releases/latest)
+
 `multiping` is a cli tool to monitor several targets at once using pings or tcp probing with optional logging of transition between states in a file.
 
 ## Demo

release.sh

@@ -43,6 +43,7 @@ for DIST in {linux,openbsd,freebsd,windows}/{amd64,arm,arm64,386} darwin/{amd64,
   [ "$GOOS" = "windows" ] && SUFFIX=".exe"
   TARGET=${BINBASE}-${GOOS}-${GOARCH}
   env CGO_ENABLED=0 GOOS=$GOOS GOARCH=$GOARCH go build -ldflags="${LDFLAGS[*]}" -mod vendor -o dist/${TARGET}${SUFFIX}
+  (cd dist; sha256sum ${TARGET}${SUFFIX}) | tee -a ${BINBASE}.sha256sum
   if [ -z "$NOCOMPRESS" ]; then
     echo "[-]    - compress"
     if [ "$GOOS" = "windows" ]; then
@@ -55,7 +56,7 @@ for DIST in {linux,openbsd,freebsd,windows}/{amd64,arm,arm64,386} darwin/{amd64,
 done
 
 echo "[*] sha256sum"
-(cd dist; sha256sum *) | tee ${BINBASE}.sha256sum
+(cd dist; sha256sum *) | tee -a ${BINBASE}.sha256sum
 mv ${BINBASE}.sha256sum dist/
 
 #echo "[*] pack"