Detect .t files as Perl

[adamflott]

Perl typically uses the .t extension for test files. There is no mandate to use the .t extension.

From a popular Perl module (https://metacpan.org/pod/Mojolicious / github.com:mojolicious/mojo.git)

~/s/p/mojo (main)> git describe
v9.45-3-gfaf712bd3

# cargo install --locked tokei version
~/s/p/mojo (main)> tokei --version
tokei 14.0.0 compiled with serialization support: json
adamflott@Adams-MacBook-Pro ~/s/p/mojo (main)> tokei .
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 Language              Files        Lines         Code     Comments       Blanks
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 CSS                       5          272          255           11            6
 HTML                      1            1            1            0            0
 JavaScript                9          476          445           30            1
 JSON                      6           30           30            0            0
 Perl                    165        36393        25573         1647         9173
 Plain Text               13         2259            0         2256            3
 YAML                      9          155          154            1            0
─────────────────────────────────────────────────────────────────────────────────
 Markdown                  4          102            0           74           28
 |- Perl                   1           30           22            2            6
 (Total)                              132           22           76           34
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 Total                   212        39718        26480         4021         9217
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
# patched .t version
~/s/p/mojo (main)> ~/src/rust/tokei/target/release/tokei .
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 Language              Files        Lines         Code     Comments       Blanks
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 CSS                       5          272          255           11            6
 HTML                      1            1            1            0            0
 JavaScript                9          476          445           30            1
 JSON                      6           30           30            0            0
 Perl                    275        71755        56525         2405        12825
 Plain Text               13         2259            0         2256            3
 YAML                      9          155          154            1            0
─────────────────────────────────────────────────────────────────────────────────
 Markdown                  4          102            0           74           28
 |- Perl                   1           30           22            2            6
 (Total)                              132           22           76           34
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 Total                   322        75080        57432         4779        12869
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━