Tests fail - ExampleReadEnvWithURL refers to unknown identifier

[teeaa]

Current master fails tests at least on Go 1.24.3:

$ go test ./...
# github.com/ilyakaznacheev/cleanenv_test
# [github.com/ilyakaznacheev/cleanenv_test]
./example_test.go:167:1: ExampleReadEnvWithURL refers to unknown identifier: ReadEnvWithURL
FAIL	github.com/ilyakaznacheev/cleanenv [build failed]
?   	github.com/ilyakaznacheev/cleanenv/example/custom_setter	[no test files]
?   	github.com/ilyakaznacheev/cleanenv/example/env_config	[no test files]
?   	github.com/ilyakaznacheev/cleanenv/example/parse_multiple_files	[no test files]
?   	github.com/ilyakaznacheev/cleanenv/example/simple_config	[no test files]
FAIL
Exception: go exited with 1