Make update script fail if pipeline fails; Also added update checks

.update-check.sh

@@ -1,7 +1,18 @@
 #!/usr/bin/env bash
 set -e
+set -o pipefail
+
+for i in curl jq; do
+    if [[ "$(command -v "${i}")" == "" ]]; then
+        echo "${i} doesn't appear to be installed."
+        missing_pkg="true"
+    fi
+done
+
+if [[ "${missing_pkg}" == "true" ]]; then
+    exit 1
+fi
 
-# The following packages are needed to function: curl, jq
 source PKGBUILD
 
 api_data="$(curl -sH "Accept: application/vnd.github.v3+json" "https://api.github.com/repos/drone/drone-cli/releases/latest")"