Update Float.parse example to actually parse a float

lib/koans/04_numbers.ex

@@ -44,7 +44,7 @@ defmodule Numbers do
   end
 
   koan "Hmm, I want to parse this but it has some strings" do
-    assert Float.parse("1 million dollars") == {___, " million dollars"}
+    assert Float.parse("1.5 million dollars") == {___, " million dollars"}
   end
 
   koan "I don't want this decimal point, let's round up" do

test/koans/numbers_koans_test.exs

@@ -12,7 +12,7 @@ defmodule NumbersTests do
       "1234",
       42,
       34.5,
-      1.0,
+      1.5,
       35.0,
       34.3,
       99.0,