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Update README.md

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Signed-off-by: David Rotermund <54365609+davrot@users.noreply.github.com>
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@ -125,6 +125,15 @@ a["one"] = "Hello"
print(a["one"]) # -> Hello
```
## del
```python
a = dict(one=1, two=2, three=3)
del a["two"]
print(a) # -> {'one': 1, 'three': 3}
```
## in
```python
@ -182,4 +191,36 @@ print(a.get("nine", 99)) # -> 99
print(a.get("nine")) # -> None
```
## \| and \|=
```python
a = dict(one=1, two=2, three=3)
b = dict(four=4, five=5, six=6, one=99)
c = a | b
print(c) # -> {'one': 99, 'two': 2, 'three': 3, 'four': 4, 'five': 5, 'six': 6}
```
```python
a = dict(one=1, two=2, three=3)
b = dict(four=4, five=5, six=6, one=99)
a |= b
print(a) # -> {'one': 99, 'two': 2, 'three': 3, 'four': 4, 'five': 5, 'six': 6}
```
## items(), keys() and values()
```python
a = dict(one=1, two=2, three=3)
print(a.items()) # -> dict_items([('one', 1), ('two', 2), ('three', 3)])
print(a.keys()) # -> dict_keys(['one', 'two', 'three'])
print(a.values()) # -> dict_values([1, 2, 3])
print(list(a.items())[0]) # -> ('one', 1)
print(list(a.keys())[0]) # -> one
print(list(a.values())[0]) # -> 1
print(a.values()[0]) # -> TypeError: 'dict_values' object is not subscriptable
```