Test improvement

[peter279k]

Changed log

• Since the php-7.0 version is inactive and let this package require php-7.1 version at least.
• Add ^7.0||^8.0 for PHPunit versions to be compatible different PHP versions.
• Add *.cache on .gitignore file to let cached file not under Git version control.
• Add test DivineOmega\WordInfo\Tests; class namespace to load test classes automatically.
• The satooshi/php-coveralls package is deprecated and using php-coveralls/php-coveralls package instead.
• Since the expected value has been changed from remote API. And the original assertions will be failed.
  To avoid failed assertion happen, using the convertObjectValueToString method to convert object value to expected array and assert expected is same as result.
• Using the assertTrue and assertFalse to assert expected is true or false.

[coveralls]

Pull Request Test Coverage Report for Build 46

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 96.721%

---

Totals
Change from base Build 45:	0.0%
Covered Lines:	59
Relevant Lines:	61

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 46

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 96.721%

---

Totals
Change from base Build 45:	0.0%
Covered Lines:	59
Relevant Lines:	61

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 46

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 96.721%

---

Totals
Change from base Build 45:	0.0%
Covered Lines:	59
Relevant Lines:	61

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 46

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 96.721%

---

Totals
Change from base Build 45:	0.0%
Covered Lines:	59
Relevant Lines:	61

---

💛 - Coveralls

[peter279k]

@DivineOmega, please look at PR at your available time. Thanks :).