Merge pull request #39 from es20490446e/master

Compatibility with libgit2 1.8+

plugins/vcs/Commit.h

@@ -52,7 +52,7 @@ class Commit final
         return std::make_shared<Commit>(commit);
     }
 
-    const git_commit* _get()
+    git_commit* _get()
     {
         return _commit;
     }

plugins/vcs/Repository.cpp

@@ -188,7 +188,7 @@ void Repository::fastForwardToTrackedRemote()
 
         error = git_checkout_tree(_repository, target, &checkoutOptions);
         GitException::ThrowOnError(error);
-        
+
         // Move the target reference to the target OID
         head->setTarget(&targetOid);
 
@@ -333,22 +333,20 @@ void Repository::createCommit(const CommitMetadata& metadata, const Reference::P
 
     // Add all working copy changes
     index->updateAll();
-
     auto tree = index->writeTree(*this);
-
-    std::vector<const git_commit*> parentCommits;
+    std::vector<git_commit*> parentCommits;
 
     // It's possible that there is no HEAD yet (first commit in the repo)
     if (head)
     {
         git_oid headOid;
         auto error = git_reference_name_to_id(&headOid, _repository, head->getName().c_str());
         GitException::ThrowOnError(error);
-        
+
         auto parentCommit = Commit::LookupFromOid(_repository, &headOid);
         parentCommits.push_back(parentCommit->_get());
     }
-    
+
     // Check if we have an additional parent
     if (additionalParent)
     {