fix interactive demo 1

[spirosChv]

Add plt.show() in Interactive Demo 1. Resolves #1060

[github-actions]

	W2D2_Tutorial1
Instructor
Student

Code report for W2D2_Tutorial1

Code report for W2D2_Tutorial1.ipynb

Quality (pyflakes)

Total code issues: 0

Style (pycodestyle)

Total PEP8 violations: 97

Common problems:

• 18 instances of E402 (module level import not at top of file)
• 16 instances of E231 (missing whitespace after ',')
• 8 instances of E226 (missing whitespace around arithmetic operator)
• 7 instances of E261 (at least two spaces before inline comment)
• 6 instances of E302 (expected 2 blank lines, found 0)
• 5 instances of E305 (expected 2 blank lines after class or function definition, found 0)
• 5 instances of E703 (statement ends with a semicolon)
• 4 instances of E128 (continuation line under-indented for visual indent)
• 4 instances of E302 (expected 2 blank lines, found 1)
• 3 instances of E501 (line too long (100 > 88 characters))

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