fix: parse correctly CLI's version

In case the current Node.js version is not officialy supported by NativeScript CLI, i.e. its new and it is not verified or support for it is deprecated, `tns --version`'s ouput contains warning.
Extract the actual version from the output no matter if there's a warning or not.

Author: rosen-vladimirov

publish/scripts/installer.js

@@ -4,7 +4,15 @@ var prompt = require('prompt-lite');
 
 const { execSync } = require('child_process');
 const semver = require('semver');
-const tnsVersionFull = execSync('tns --version', { encoding: 'ascii'});
+// In case the current Node.js version is not supported by CLI, a warning in `tns --version` output is shown.
+// Sample output:
+//
+/*Support for Node.js ^8.0.0 is deprecated and will be removed in one of the next releases of NativeScript. Please, upgrade to the latest Node.js LTS version.
+
+6.0.0
+*/
+// Extract the actual version (6.0.0) from it.
+const tnsVersionFull = (execSync('tns --version', { encoding: 'ascii'}).match(/^(?:\d+\.){2}\d+.*?$/m) || [])[0];
 
 // iOS modern build system is supported from version NativeScript-CLI version 5.2.0
 const supportsIOSModernBuildSystem = tnsVersionFull.indexOf("5.2.0-") > -1 || semver.gte(tnsVersionFull, "5.2.0");

src/scripts/postinstall.js

@@ -2251,7 +2251,7 @@ function coerce(version) {
   if (match == null)
     return null;
 
-  return parse((match[1] || '0') + '.' + (match[2] || '0') + '.' + (match[3] || '0')); 
+  return parse((match[1] || '0') + '.' + (match[2] || '0') + '.' + (match[3] || '0'));
 }
 
 
@@ -4176,7 +4176,15 @@ var prompt = __webpack_require__(/*! prompt-lite */ 1);
 
 const { execSync } = __webpack_require__(/*! child_process */ 3);
 const semver = __webpack_require__(/*! semver */ 2);
-const tnsVersionFull = execSync('tns --version', { encoding: 'ascii'});
+// In case the current Node.js version is not supported by CLI, a warning in `tns --version` output is shown.
+// Sample output:
+//
+/*Support for Node.js ^8.0.0 is deprecated and will be removed in one of the next releases of NativeScript. Please, upgrade to the latest Node.js LTS version.
+
+6.0.0
+*/
+// Extract the actual version (6.0.0) from it.
+const tnsVersionFull = (execSync('tns --version', { encoding: 'ascii'}).match(/^(?:\d+\.){2}\d+.*?$/m) || [])[0];
 
 // iOS modern build system is supported from version NativeScript-CLI version 5.2.0
 const supportsIOSModernBuildSystem = tnsVersionFull.indexOf("5.2.0-") > -1 || semver.gte(tnsVersionFull, "5.2.0");