refactor: change CCol cols attribute to col attribute

src/views/users/User.vue

@@ -1,6 +1,6 @@
 <template>
   <CRow>
-    <CCol cols="12" lg="6">
+    <CCol col="12" lg="6">
       <CCard>
         <CCardHeader>
           User id:  {{ $route.params.id }}

src/views/users/Users.vue

@@ -1,6 +1,6 @@
 <template>
   <CRow>
-    <CCol cols="12" xl="8">
+    <CCol col="12" xl="8">
       <transition name="slide">
         <CCard headerHtml="users" bodyWrapper>
           <CTable hover