Fix Embulk installation

ebulk

@@ -452,7 +452,7 @@ function checkSoftware {
         if ! checkCurl; then
             return 1
         fi
-        curl --create-dirs -o $embulk -L "https://dl.bintray.com/embulk/maven/embulk-$EMBULK_VERSION.jar"
+        curl --create-dirs -o $embulk -L "https://github.com/embulk/embulk/releases/download/v$EMBULK_VERSION/embulk-$EMBULK_VERSION.jar"
         chmod +x $embulk
         if hash $embulk 2>/dev/null; then
 		echo "[INFO] Done. Embulk successfully installed."
@@ -462,7 +462,7 @@ function checkSoftware {
 		echo
 		echo "[INFO] Plase, try manual installation. Run:"
 		echo
-		echo 'curl --create-dirs -o ~/.embulk/bin/embulk -L "https://dl.bintray.com/embulk/maven/embulk-$EMBULK_VERSION.jar"'
+		echo 'curl --create-dirs -o ~/.embulk/bin/embulk -L "https://github.com/embulk/embulk/releases/download/v$EMBULK_VERSION/embulk-$EMBULK_VERSION.jar"'
 		echo "chmod +x ~/.embulk/bin/embulk"
 		echo -e "echo 'export PATH=\"\$HOME/.embulk/bin:\$PATH\"' >> ~/.bashrc"
 		echo "source ~/.bashrc"
@@ -471,8 +471,8 @@ function checkSoftware {
     else
 	version=$($embulk --version 2>&1 | awk -F ' ' '/embulk/ {print $2}')
 	echo "[INFO] Current embulk version: "$version""
-        if [[ "$version" < "$EMBULK_VERSION" ]]; then
-            echo "Your embulk version is too old. Upgrading embulk to version $EMBULK_VERSION"
+        if [[ "$version" != "$EMBULK_VERSION" ]]; then
+            echo "Upgrading embulk to version $EMBULK_VERSION"
 	    $embulk selfupdate $EMBULK_VERSION
         fi
     fi