Updating HELK after latest PR

scripts/helk_linux_deb_install.sh

@@ -51,6 +51,13 @@ ERROR=$?
         echoerror "Could not install openjdk-8-jre-headless (Error Code: $ERROR)."
     fi
     
+echo "[HELK-BASH-INSTALLATION-INFO] Installing curl.."
+apt-get install -y curl >> $LOGFILE 2>&1
+ERROR=$?
+    if [ $ERROR -ne 0 ]; then
+        echoerror "Could not install curl (Error Code: $ERROR)."
+    fi    
+
 # Elastic signs all of their packages with their own Elastic PGP signing key.
 echo "[HELK-BASH-INSTALLATION-INFO] Downloading and installing (writing to a file) the public signing key to the host.."
 wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add - >> $LOGFILE 2>&1