Fixed SEMRush to SemRush calls in Readme
Fixed SEMRush examples
Merging upstream
Added possibility to get SISTRIX VI via the provided API; fixed some typos
Added methods to check for API credits before doing the Sistrix API Request
Refactored code, TODO: Exceptions in getters, Tests
Refactored database and url validation
Fixed bug with offset
Refactored like suggested; removed BC break
Merge branch 'master' into sistrix
Tried to get SISTRIX tests running; currently fails to mock hasApiKey
we can only mock with the class reference static
add group to sistrix tests
fix sistrix mocking
fix the case that we have valid json but no valid result
rename assert file and add null result for ApiRequest
add assert files for getCredits
add more test
Merge pull request #1 from ClemensSahs/hotfix/sistrix-wip

fix mocking problem
Merge pull request #2 from ClemensSahs/hotfix/sistrix-wip-more-test

add more test