More variants for the `-` thickness

• The requested variant shape does not go too far away from Iosevka's design.
• The requested variant does not conflict with any characters in Unicode that Iosevka currently supports.
• For each variant you requested, there are at least two monospace/programming fonts created by different designers supported the requested variant. Provide images below.

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Please provide your justification here.

Yes, i would love to have a thicker - character. If we could have some variants for it that would be perfect!