Fix treating no type change as incompatible

[oguzhanunlu]

Issue details are at #197

[coveralls]

Pull Request Test Coverage Report for Build 7902582542

Details

• -6 of 9 (33.33%) changed or added relevant lines in 1 file are covered.
• 9 unchanged lines in 8 files lost coverage.
• Overall coverage increased (+0.6%) to 80.814%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
modules/core/src/main/scala/com.snowplowanalytics/iglu.schemaddl/redshift/ShredModel.scala	3	9	33.33%

Files with Coverage Reduction	New Missed Lines	%
modules/core/src/main/scala/com.snowplowanalytics/iglu.schemaddl/jsonschema/circe/CommonCodecs.scala	1	66.67%
modules/core/src/main/scala/com.snowplowanalytics/iglu.schemaddl/jsonschema/circe/NumberCodecs.scala	1	70.37%
modules/core/src/main/scala/com.snowplowanalytics/iglu.schemaddl/jsonschema/circe/StringCodecs.scala	1	78.57%
modules/core/src/main/scala/com.snowplowanalytics/iglu.schemaddl/jsonschema/mutate/Widened.scala	1	86.36%
modules/core/src/main/scala/com.snowplowanalytics/iglu.schemaddl/jsonschema/package.scala	1	61.76%
modules/core/src/main/scala/com.snowplowanalytics/iglu.schemaddl/parquet/Suggestion.scala	1	91.43%
modules/core/src/main/scala/com.snowplowanalytics/iglu.schemaddl/redshift/package.scala	1	84.0%
modules/core/src/main/scala/com.snowplowanalytics/iglu.schemaddl/redshift/internal/ColumnTypeSuggestions.scala	2	78.89%

Totals
Change from base Build 6507465308:	0.6%
Covered Lines:	1251
Relevant Lines:	1548

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💛 - Coveralls