Bundle builder failing on Mac

[Tristan Croll]

The following bug report has been submitted:
Platform:        Darwin-18.7.0-x86_64-i386-64bit
ChimeraX Version: 1.0 (2020-06-04 23:15:07 UTC)
Description
Bundle builder is failing on the Mac at the final step because `BundleBuilder.wheel_path` is being set to:

./dist/ChimeraX_Clipper-0.13.0-cp37-cp37m-macosx_10_13_x86_64.whl 

... when the actual wheel is:

./dist/ChimeraX_Clipper-0.13.0-cp37-cp37m-macosx_10_14_x86_64.whl 

(I'm running 10.14.6). The bundle is actually still built and installs OK after the fact, but the discrepancy is a bit weird.

Log:
UCSF ChimeraX version: 1.0 (2020-06-04)  
© 2016-2020 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> toolshed install /Users/tic20/my-gits/chimerax-
> clipper/dist/ChimeraX_Clipper-0.13.0-cp37-cp37m-macosx_10_14_x86_64.whl

Successfully installed ChimeraX-Clipper-0.13.0  
Installed ChimeraX-Clipper (0.13.0)  




OpenGL version: 4.1 INTEL-12.10.12
OpenGL renderer: Intel(R) HD Graphics 6000
OpenGL vendor: Intel Inc.Hardware:

    Hardware Overview:

      Model Name: MacBook Air
      Model Identifier: MacBookAir7,2
      Processor Name: Intel Core i5
      Processor Speed: 1.6 GHz
      Number of Processors: 1
      Total Number of Cores: 2
      L2 Cache (per Core): 256 KB
      L3 Cache: 3 MB
      Hyper-Threading Technology: Enabled
      Memory: 8 GB
      Boot ROM Version: 188.0.0.0.0
      SMC Version (system): 2.27f2

Software:

    System Software Overview:

      System Version: macOS 10.14.6 (18G95)
      Kernel Version: Darwin 18.7.0
      Time since boot: 106 days 1:40

Graphics/Displays:

    Intel HD Graphics 6000:

      Chipset Model: Intel HD Graphics 6000
      Type: GPU
      Bus: Built-In
      VRAM (Dynamic, Max): 1536 MB
      Vendor: Intel
      Device ID: 0x1626
      Revision ID: 0x0009
      Metal: Supported, feature set macOS GPUFamily1 v4
      Displays:
        Color LCD:
          Display Type: LCD
          Resolution: 1440 x 900 (Widescreen eXtended Graphics Array Plus)
          UI Looks like: 1440 x 900
          Framebuffer Depth: 24-Bit Color (ARGB8888)
          Main Display: Yes
          Mirror: Off
          Online: Yes
          Rotation: Supported
          Automatically Adjust Brightness: No
          Connection Type: DisplayPort

PyQt version: 5.12.3
Compiled Qt version: 5.12.4
Runtime Qt version: 5.12.8