fix(ccfinder): update mail text

[huangyoukun]

Checklist:

• test cases has added or updated
• documentation has added or updated
• commit message follows the convention commit guidelines

[codecov-io]

Codecov Report

Merging #108 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #108   +/-   ##
=======================================
  Coverage   32.36%   32.36%           
=======================================
  Files          39       39           
  Lines        2070     2070           
=======================================
  Hits          670      670           
  Misses       1400     1400

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 25685bc...1c0b35d. Read the comment docs.