Node.js SDK -- Lock TypeScript Version to 1.8.10

Locking the TypeScript version to 1.8.10, as the
newest versions of 2.0.x break the current SDK build.

Change-Id: I354df2da88d7a284b29373e9ff79699d4ab3cd71
Signed-off-by: Anna D Derbakova <adderbak@us.ibm.com>

sdk/node/package.json

@@ -28,6 +28,7 @@
     "sjcl-codec": "0.1.1",
     "sleep": "^3.0.1",
     "tar-fs": "^1.13.0",
+    "typescript": "1.8.10",
     "url": "^0.11.0",
     "util": "^0.10.3",
     "uuidv4": "^0.3.1"