docs: Update README with deprecation information for v5

[lukaszsocha2]

Clarified deprecation details for the com.box.sdk package and its support timeline.

[coveralls]

Pull Request Test Coverage Report for Build #5279

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 13.665%

---

Totals
Change from base Build #5275:	0.0%
Covered Lines:	8374
Relevant Lines:	61282

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build #5283

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 14 unchanged lines in 8 files lost coverage.
• Overall coverage decreased (-0.009%) to 13.656%

---

Files with Coverage Reduction	New Missed Lines	%
src/main/java/com/box/sdkgen/box/errors/RequestInfo.java	1	0.0%
src/main/java/com/box/sdkgen/box/errors/ResponseInfo.java	1	0.0%
src/main/java/com/box/sdkgen/client/BoxClient.java	1	0.0%
src/main/java/com/box/sdk/RealtimeServerConnection.java	1	77.78%
src/main/java/com/box/sdkgen/box/eventstream/EventStreamIterator.java	2	0.0%
src/main/java/com/box/sdkgen/box/jwtauth/JWTConfig.java	2	0.0%
src/main/java/com/box/sdkgen/networking/boxnetworkclient/BoxNetworkClient.java	3	0.0%
src/main/java/com/box/sdkgen/networking/defaultnetworkclient/DefaultNetworkClient.java	3	0.0%

Totals
Change from base Build #5275:	-0.009%
Covered Lines:	8368
Relevant Lines:	61275

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build #5280

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 13.665%

---

Totals
Change from base Build #5275:	0.0%
Covered Lines:	8374
Relevant Lines:	61282

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build #5293

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 13.665%

---

Totals
Change from base Build #5275:	0.0%
Covered Lines:	8374
Relevant Lines:	61282

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build #5281

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 14 unchanged lines in 8 files lost coverage.
• Overall coverage decreased (-0.009%) to 13.656%

---

Files with Coverage Reduction	New Missed Lines	%
src/main/java/com/box/sdkgen/box/errors/RequestInfo.java	1	0.0%
src/main/java/com/box/sdkgen/box/errors/ResponseInfo.java	1	0.0%
src/main/java/com/box/sdkgen/client/BoxClient.java	1	0.0%
src/main/java/com/box/sdk/RealtimeServerConnection.java	1	77.78%
src/main/java/com/box/sdkgen/box/eventstream/EventStreamIterator.java	2	0.0%
src/main/java/com/box/sdkgen/box/jwtauth/JWTConfig.java	2	0.0%
src/main/java/com/box/sdkgen/networking/boxnetworkclient/BoxNetworkClient.java	3	0.0%
src/main/java/com/box/sdkgen/networking/defaultnetworkclient/DefaultNetworkClient.java	3	0.0%

Totals
Change from base Build #5275:	-0.009%
Covered Lines:	8368
Relevant Lines:	61275

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build #5282

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 13.665%

---

Totals
Change from base Build #5275:	0.0%
Covered Lines:	8374
Relevant Lines:	61282

---

💛 - Coveralls