Update README.md

Author: cybcon

README.md

@@ -2,11 +2,11 @@
 
 Maintained by: [Michael Oberdorf IT-Consulting](https://www.oberdorf-itc.de/)
 
-Source code: [Bitbucket](https://bitbucket.org/Cybcon/modbus-server/src/master/)
+Source code: [GitHub](https://github.com/cybcon/modbus-server)
 
 # Supported tags and respective `Dockerfile` links
 
-* [`latest`, `1.1.2`](https://bitbucket.org/Cybcon/modbus-server/src/1.1.2/Dockerfile)
+* [`latest`, `1.1.2`](https://github.com/cybcon/modbus-server/blob/1.1.2/Dockerfile)
 
 # What is Modbus TCP Server?
 
@@ -137,4 +137,4 @@ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+SOFTWARE.