fixed typo

app.py

@@ -168,7 +168,7 @@ import requests
 import base64
 
 def get_image(prompt="Random monster"):
-    openai.api_key = os.getevn("OPENAI_KEY")
+    openai.api_key = os.getenv("OPENAI_KEY")
     response = openai.Image.create(
     prompt = prompt + ", realistic fantasy style",
     n=1,
@@ -190,7 +190,7 @@ def make_image_and_story(prompt):
 
     caption = get_caption("sample.png")
 
-    co = cohere.Client(os.getevn("COHERE_KEY"))
+    co = cohere.Client(os.getenv("COHERE_KEY"))
     response = co.generate(prompt=caption, model ='aeb523c3-a79c-48ba-9274-a12ac07492a2-ft', max_tokens=80)
 
     return Image.open("sample.png"), processing(response.generations[0].text)