travis CI fixes

CppCoreGuidelines.md

@@ -158,7 +158,7 @@ You can look at design concepts used to express the rules:
 
 * assertion: ???
 * error: ???
-* exception: [exception guarantee[(???)]
+* exception: exception guarantee (???)
 * failure: ???
 * invariant: ???
 * leak: ???
@@ -17428,6 +17428,7 @@ C++17
 ##### Enforcement
 
 ???
+
 ### <a name="Rstr-span"></a>Sl.str.11: Use `gsl::string_span` rather than `std::string_view` when you need to mutate a string
 
 ##### Reason
@@ -17630,7 +17631,7 @@ This leads to longer programs and more errors caused by uninitialized and wrongl
            i = g(x, c);
        }
        return i;
-   }
+    }
 
 The larger the distance between the uninitialized variable and its use, the larger the chance of a bug.
 Fortunately, compilers catch many "used before set" errors.