[BUG] Fixing the grid function

[Sov-trotter]

Before Filing a Report

• Did I read the Documentation and/or docstrings?
• Did I search the Javis GitHub to see if this bug has already been reported?
• Am I familiar with the Javis philosophy?
• Do I have the latest version of Javis installed?

Describe the bug
A clear and concise description of what the bug is.
Cross posting here from the conversation on zulip https://julialang.zulipchat.com/#narrow/stream/253420-javis/topic/Keep.20the.20last.20frame.20of.20a.20Grid

To Reproduce

1. Julia Version (i.e. output of julia -v):
   1.5.0
2. Operating system (Mac, Linux, Windows):
   Linux
3. Javis version (i.e output of ] status Javis in the REPL)
   v0.3.0
4. Minimum working code example that led to bug:
   grid = Object(1:100, draw_grid(direction = "BL", line_gap = 50))
   Expected Behavior and Actual Behavior

A clear and concise description of what you expected to happen followed up with an explanation of what actually happened.
The grid was supposed to generate and stay after frame 100, but it vanishes.

Stacktrace (If Applicable)
If the stacktrace includes some ffmpeg error please set the kwarg ffmpeg_loglevel to "info" i.e render(your_video, "your_animation.gif", ffmpeg_loglevel = "info")

Screenshots
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Additional context
Add any other context about the problem here.

[Wikunia]

This is more or less described in #38 (comment)