Update README.md

[lorrin]

Add note about potential need to supply @JsonCreator even when using version 2.6.

[lpandzic]

What issues? Any links to jackson issues?

[cowtowncoder]

There should be an issue in jackson-databind, but I forget exact id. The problem is that discovery of JSON creator methods occurs too late to allow them to be merged, unless actual annotation is used.

[cowtowncoder]

Not sure if there is specific RFE issue for this, but couple of other issues are related. For example:

• Problem with NamingStrategy, creator methods with implicit names jackson-databind#806 - "Problem with NamingStrategy, creator methods with implicit names"
• Ensure Constructor Parameter annotations are linked with those of Field, Getter, or Setter jackson-databind#792 - "Ensure Constructor Parameter annotations are linked with those of Field, Getter, or Setter"

For the first issue, 806, there is also matching failing test that shows where use of @JsonCreator is actually needed, even though intent at this point is that it should not be.