update some errror messages

cron/handler.go

@@ -107,7 +107,7 @@ func (h *handler) loadVersions(servers []string) ([]*shared_models.Version, erro
 		Code: versionCodes,
 	})
 	if err != nil {
-		return nil, errors.Wrap(err, "Couldn't load versions")
+		return nil, errors.Wrap(err, "cannot load versions")
 	}
 
 	return versionList.Items, nil

group/repository/group_pg_repo.go

@@ -20,7 +20,7 @@ func NewPgRepo(db *pg.DB) (group.Repository, error) {
 		IfNotExists:   true,
 		FKConstraints: true,
 	}); err != nil {
-		return nil, errors.Wrap(err, "Cannot create 'groups' table")
+		return nil, errors.Wrap(err, "cannot create 'groups' table")
 	}
 	return &pgRepo{db}, nil
 }

observation/repository/observation_pg_repo.go

@@ -20,7 +20,7 @@ func NewPgRepo(db *pg.DB) (observation.Repository, error) {
 		IfNotExists:   true,
 		FKConstraints: true,
 	}); err != nil {
-		return nil, errors.Wrap(err, "Cannot create 'observations' table")
+		return nil, errors.Wrap(err, "cannot create 'observations' table")
 	}
 	return &pgRepo{db}, nil
 }

server/repository/server_pg_repo.go

@@ -19,7 +19,7 @@ func NewPgRepo(db *pg.DB) (server.Repository, error) {
 	if err := db.Model((*models.Server)(nil)).CreateTable(&orm.CreateTableOptions{
 		IfNotExists: true,
 	}); err != nil {
-		return nil, errors.Wrap(err, "Cannot create 'servers' table")
+		return nil, errors.Wrap(err, "cannot create 'servers' table")
 	}
 	return &pgRepo{db}, nil
 }