Upgrade lstm-text-generation and jena-weather to tfjs 1.7.4 (#369)

- Upgrade to latest (2.6.0) is blocked by ES module issue in unit tests
- Also upgrades tfjs-vis to 1.4.3 (latest)

Manually tested the example in both browser and node.js to make sure the training and inference is still working.

Author: caisq

jena-weather/package.json

@@ -9,8 +9,8 @@
     "node": ">=8.9.0"
   },
   "dependencies": {
-    "@tensorflow/tfjs": "^1.3.2",
-    "@tensorflow/tfjs-vis": "^1.0.3"
+    "@tensorflow/tfjs": "^1.7.4",
+    "@tensorflow/tfjs-vis": "^1.4.3"
   },
   "scripts": {
     "watch": "cross-env NODE_ENV=development parcel index.html --no-hmr --open",
@@ -20,8 +20,8 @@
     "train-rnn": "babel-node --max_old_space_size=4096 train-rnn.js"
   },
   "devDependencies": {
-    "@tensorflow/tfjs-node": "^1.3.2",
-    "@tensorflow/tfjs-node-gpu": "^1.3.2",
+    "@tensorflow/tfjs-node": "^1.7.4",
+    "@tensorflow/tfjs-node-gpu": "^1.7.4",
     "argparse": "^1.0.10",
     "babel-cli": "^6.26.0",
     "babel-core": "^6.26.3",