Fix inconsistent Bash file names in README.md

[shoichiaizawa]

e649ad1 Fix inconsistent Bash file names in README.md

The Bash file names appear in the latter part of "Installation" section of the README.md file have to be in "kebab-case" (hyphen-separated case) instead of "snake_case", in order for them to be consistent with the actual file names in the examples directory.

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Message from the collaborator

Please review my commit and if necessary, rectify as appropriate.

Thank you!

sho