Remove "-r" when installing Petals in examples (#122)

examples/prompt-tuning-personachat.ipynb

@@ -36,7 +36,7 @@
     "import subprocess\n",
     "import sys\n",
     "\n",
-    "!pip install -r git+https://github.com/bigscience-workshop/petals\n",
+    "!pip install git+https://github.com/bigscience-workshop/petals\n",
     "!pip install datasets wandb\n",
     "\n",
     "IN_COLAB = 'google.colab' in sys.modules\n",

examples/prompt-tuning-sst2.ipynb

@@ -36,7 +36,7 @@
     "import subprocess\n",
     "import sys\n",
     "\n",
-    "!pip install -r git+https://github.com/bigscience-workshop/petals\n",
+    "!pip install git+https://github.com/bigscience-workshop/petals\n",
     "!pip install datasets wandb\n",
     "\n",
     "IN_COLAB = 'google.colab' in sys.modules\n",