Set version to 0.7.4

Signed-off-by: Release-Candidate <rec@gmx.at>

package.json

@@ -1,7 +1,7 @@
 {
     "name": "vscode-scheme-repl",
     "displayName": "Chez Scheme REPL",
-    "version": "0.7.3",
+    "version": "0.7.4",
     "preview": false,
     "publisher": "release-candidate",
     "description": "Support for Chez Scheme: Highlighting, autocompletion, documentation on hover and syntax checks.",