Update version in package.json to 1.7.0

Extension/package.json

@@ -2,7 +2,7 @@
   "name": "cpptools",
   "displayName": "C/C++",
   "description": "C/C++ IntelliSense, debugging, and code browsing.",
-  "version": "1.6.0-main",
+  "version": "1.7.0-main",
   "publisher": "ms-vscode",
   "icon": "LanguageCCPP_color_128x.png",
   "readme": "README.md",